diff --git a/devtools/client/accessibility/panel.js b/devtools/client/accessibility/panel.js
index 1e57f2b69a0a..aa4ffdd63732 100644
--- a/devtools/client/accessibility/panel.js
+++ b/devtools/client/accessibility/panel.js
@@ -50,9 +50,10 @@ const EVENTS = {
  * render Accessibility Tree of the current debugger target and the sidebar that
  * displays current relevant accessible details.
  */
-function AccessibilityPanel(iframeWindow, toolbox) {
+function AccessibilityPanel(iframeWindow, toolbox, commands) {
   this.panelWin = iframeWindow;
   this._toolbox = toolbox;
+  this._commands = commands;
 
   this.onTabNavigated = this.onTabNavigated.bind(this);
   this.onTargetUpdated = this.onTargetUpdated.bind(this);
diff --git a/devtools/client/application/panel.js b/devtools/client/application/panel.js
index 2165d69f8ed6..a74f01ee253c 100644
--- a/devtools/client/application/panel.js
+++ b/devtools/client/application/panel.js
@@ -16,10 +16,13 @@ class ApplicationPanel {
    *        The frame/window dedicated to this panel.
    * @param {Toolbox} toolbox
    *        The toolbox instance responsible for this panel.
+   * @param {Object} commands
+   *        The commands object with all interfaces defined from devtools/shared/commands/
    */
-  constructor(panelWin, toolbox) {
+  constructor(panelWin, toolbox, commands) {
     this.panelWin = panelWin;
     this.toolbox = toolbox;
+    this.commands = commands;
   }
 
   async open() {
diff --git a/devtools/client/debugger/panel.js b/devtools/client/debugger/panel.js
index 24da5a1aef3a..f30f9ea5fb5a 100644
--- a/devtools/client/debugger/panel.js
+++ b/devtools/client/debugger/panel.js
@@ -37,10 +37,11 @@ async function getNodeFront(gripOrFront, toolbox) {
 }
 
 class DebuggerPanel {
-  constructor(iframeWindow, toolbox) {
+  constructor(iframeWindow, toolbox, commands) {
     this.panelWin = iframeWindow;
     this.panelWin.L10N = L10N;
     this.toolbox = toolbox;
+    this.commands = commands;
   }
 
   async open() {
diff --git a/devtools/client/definitions.js b/devtools/client/definitions.js
index 7074f10f1770..bbd71c229eed 100644
--- a/devtools/client/definitions.js
+++ b/devtools/client/definitions.js
@@ -125,8 +125,8 @@ Tools.options = {
     return true;
   },
 
-  build: function(iframeWindow, toolbox) {
-    return new OptionsPanel(iframeWindow, toolbox);
+  build: function(iframeWindow, toolbox, commands) {
+    return new OptionsPanel(iframeWindow, toolbox, commands);
   },
 };
 
@@ -162,8 +162,8 @@ Tools.inspector = {
     return target.hasActor("inspector");
   },
 
-  build: function(iframeWindow, toolbox) {
-    return new InspectorPanel(iframeWindow, toolbox);
+  build: function(iframeWindow, toolbox, commands) {
+    return new InspectorPanel(iframeWindow, toolbox, commands);
   },
 };
 Tools.webConsole = {
@@ -197,8 +197,8 @@ Tools.webConsole = {
   isTargetSupported: function() {
     return true;
   },
-  build: function(iframeWindow, toolbox) {
-    return new WebConsolePanel(iframeWindow, toolbox);
+  build: function(iframeWindow, toolbox, commands) {
+    return new WebConsolePanel(iframeWindow, toolbox, commands);
   },
 };
 
@@ -221,8 +221,8 @@ Tools.jsdebugger = {
   isTargetSupported: function() {
     return true;
   },
-  build: function(iframeWindow, toolbox) {
-    return new DebuggerPanel(iframeWindow, toolbox);
+  build: function(iframeWindow, toolbox, commands) {
+    return new DebuggerPanel(iframeWindow, toolbox, commands);
   },
 };
 
@@ -246,8 +246,8 @@ Tools.styleEditor = {
     return target.hasActor("styleSheets");
   },
 
-  build: function(iframeWindow, toolbox) {
-    return new StyleEditorPanel(iframeWindow, toolbox);
+  build: function(iframeWindow, toolbox, commands) {
+    return new StyleEditorPanel(iframeWindow, toolbox, commands);
   },
 };
 
@@ -274,8 +274,8 @@ function switchPerformancePanel() {
   ) {
     Tools.performance.url =
       "chrome://devtools/content/performance-new/index.xhtml";
-    Tools.performance.build = function(frame, target) {
-      return new NewPerformancePanel(frame, target);
+    Tools.performance.build = function(frame, toolbox, commands) {
+      return new NewPerformancePanel(frame, toolbox, commands);
     };
     Tools.performance.isTargetSupported = function(target) {
       // Only use the new performance panel on local tab toolboxes, as they are guaranteed
@@ -287,8 +287,8 @@ function switchPerformancePanel() {
     };
   } else {
     Tools.performance.url = "chrome://devtools/content/performance/index.xhtml";
-    Tools.performance.build = function(frame, target) {
-      return new PerformancePanel(frame, target);
+    Tools.performance.build = function(frame, toolbox, commands) {
+      return new PerformancePanel(frame, toolbox, commands);
     };
     Tools.performance.isTargetSupported = function(target) {
       return target.hasActor("performance");
@@ -327,8 +327,8 @@ Tools.memory = {
     return !target.isAddon && !target.isWorkerTarget;
   },
 
-  build: function(frame, target) {
-    return new MemoryPanel(frame, target);
+  build: function(frame, toolbox, commands) {
+    return new MemoryPanel(frame, toolbox, commands);
   },
 };
 
@@ -354,8 +354,8 @@ Tools.netMonitor = {
     return target.getTrait("networkMonitor") && !target.isWorkerTarget;
   },
 
-  build: function(iframeWindow, toolbox) {
-    return new NetMonitorPanel(iframeWindow, toolbox);
+  build: function(iframeWindow, toolbox, commands) {
+    return new NetMonitorPanel(iframeWindow, toolbox, commands);
   },
 };
 
@@ -381,8 +381,8 @@ Tools.storage = {
     return target.hasActor("storage");
   },
 
-  build: function(iframeWindow, toolbox) {
-    return new StoragePanel(iframeWindow, toolbox);
+  build: function(iframeWindow, toolbox, commands) {
+    return new StoragePanel(iframeWindow, toolbox, commands);
   },
 };
 
@@ -408,8 +408,8 @@ Tools.dom = {
     return true;
   },
 
-  build: function(iframeWindow, toolbox) {
-    return new DomPanel(iframeWindow, toolbox);
+  build: function(iframeWindow, toolbox, commands) {
+    return new DomPanel(iframeWindow, toolbox, commands);
   },
 };
 
@@ -435,8 +435,8 @@ Tools.accessibility = {
     return target.hasActor("accessibility");
   },
 
-  build(iframeWindow, toolbox) {
-    return new AccessibilityPanel(iframeWindow, toolbox);
+  build(iframeWindow, toolbox, commands) {
+    return new AccessibilityPanel(iframeWindow, toolbox, commands);
   },
 };
 
@@ -455,8 +455,8 @@ Tools.application = {
     return target.hasActor("manifest");
   },
 
-  build: function(iframeWindow, toolbox) {
-    return new ApplicationPanel(iframeWindow, toolbox);
+  build: function(iframeWindow, toolbox, commands) {
+    return new ApplicationPanel(iframeWindow, toolbox, commands);
   },
 };
 
diff --git a/devtools/client/dom/panel.js b/devtools/client/dom/panel.js
index a6110748a5a8..f0059343f9d4 100644
--- a/devtools/client/dom/panel.js
+++ b/devtools/client/dom/panel.js
@@ -17,9 +17,10 @@ loader.lazyRequireGetter(
  * This object represents DOM panel. It's responsibility is to
  * render Document Object Model of the current debugger target.
  */
-function DomPanel(iframeWindow, toolbox) {
+function DomPanel(iframeWindow, toolbox, commands) {
   this.panelWin = iframeWindow;
   this._toolbox = toolbox;
+  this._commands = commands;
 
   this.onTabNavigated = this.onTabNavigated.bind(this);
   this.onTargetAvailable = this.onTargetAvailable.bind(this);
diff --git a/devtools/client/framework/test/browser_tab_descriptor_fission.js b/devtools/client/framework/test/browser_tab_descriptor_fission.js
index 06660188d4cd..8463afa2c7f5 100644
--- a/devtools/client/framework/test/browser_tab_descriptor_fission.js
+++ b/devtools/client/framework/test/browser_tab_descriptor_fission.js
@@ -26,6 +26,15 @@ add_task(async function() {
   );
   ok(tabDescriptor, "Should have a descriptor actor for the tab");
 
+  const firstCommands = await tabDescriptor.getCommands();
+  ok(firstCommands, "Got commands");
+  const secondCommands = await tabDescriptor.getCommands();
+  is(
+    firstCommands,
+    secondCommands,
+    "Multiple calls to getCommands return the same commands object"
+  );
+
   is(
     target.descriptorFront,
     tabDescriptor,
diff --git a/devtools/client/framework/toolbox.js b/devtools/client/framework/toolbox.js
index b7c3514d267d..2a3d4ffb48e3 100644
--- a/devtools/client/framework/toolbox.js
+++ b/devtools/client/framework/toolbox.js
@@ -237,6 +237,7 @@ function Toolbox(
   this.telemetry = new Telemetry();
 
   this.descriptorFront = descriptorFront;
+
   this.targetList = new TargetList(descriptorFront);
   this.targetList.on(
     "target-thread-wrong-order-on-resume",
@@ -778,6 +779,12 @@ Toolbox.prototype = {
         );
       });
 
+      // This attribute is meant to be a public attribute on the Toolbox object
+      // It exposes commands modules listed in devtools/shared/commands/index.js
+      // which are an abstraction on top of RDP methods.
+      // See devtools/shared/commands/README.md
+      this.commands = await this.descriptorFront.getCommands();
+
       // Optimization: fire up a few other things before waiting on
       // the iframe being ready (makes startup faster)
       await this.targetList.startListening();
@@ -2479,7 +2486,7 @@ Toolbox.prototype = {
         // be fired with the panel as an argument. However, in order to keep
         // backward compatibility with existing extensions do a check
         // for a promise return value.
-        let built = definition.build(iframe.contentWindow, this);
+        let built = definition.build(iframe.contentWindow, this, this.commands);
 
         if (!(typeof built.then == "function")) {
           const panel = built;
diff --git a/devtools/client/fronts/descriptors/descriptor-mixin.js b/devtools/client/fronts/descriptors/descriptor-mixin.js
index 50ed38102c54..64d6a54d763b 100644
--- a/devtools/client/fronts/descriptors/descriptor-mixin.js
+++ b/devtools/client/fronts/descriptors/descriptor-mixin.js
@@ -4,6 +4,8 @@
 
 "use strict";
 
+const { createCommandsDictionary } = require("devtools/shared/commands/index");
+
 /**
  * A Descriptor represents a debuggable context. It can be a browser tab, a tab on
  * a remote device, like a tab on Firefox for Android. But it can also be an add-on,
@@ -24,6 +26,13 @@ function DescriptorMixin(parentClass) {
     get client() {
       return this._client;
     }
+
+    async getCommands() {
+      if (!this._commands) {
+        this._commands = createCommandsDictionary(this);
+      }
+      return this._commands;
+    }
   }
   return Descriptor;
 }
diff --git a/devtools/client/inspector/inspector.js b/devtools/client/inspector/inspector.js
index 4e79338501d3..4c38f413b7d8 100644
--- a/devtools/client/inspector/inspector.js
+++ b/devtools/client/inspector/inspector.js
@@ -142,10 +142,11 @@ const TELEMETRY_SCALAR_NODE_SELECTION_COUNT =
  *      Fired when the stylesheet source links have been updated (when switching
  *      to source-mapped files)
  */
-function Inspector(toolbox) {
+function Inspector(toolbox, commands) {
   EventEmitter.decorate(this);
 
   this._toolbox = toolbox;
+  this._commands = commands;
   this.panelDoc = window.document;
   this.panelWin = window;
   this.panelWin.inspector = this;
@@ -284,6 +285,10 @@ Inspector.prototype = {
     return this._toolbox;
   },
 
+  get commands() {
+    return this._commands;
+  },
+
   /**
    * Get the list of InspectorFront instances that correspond to all of the inspectable
    * targets in remote frames nested within the document inspected here, as well as the
diff --git a/devtools/client/inspector/panel.js b/devtools/client/inspector/panel.js
index 7f23b58156cc..3b2375b68b52 100644
--- a/devtools/client/inspector/panel.js
+++ b/devtools/client/inspector/panel.js
@@ -4,8 +4,8 @@
 
 "use strict";
 
-function InspectorPanel(iframeWindow, toolbox) {
-  this._inspector = new iframeWindow.Inspector(toolbox);
+function InspectorPanel(iframeWindow, toolbox, commands) {
+  this._inspector = new iframeWindow.Inspector(toolbox, commands);
 }
 InspectorPanel.prototype = {
   open() {
diff --git a/devtools/client/memory/panel.js b/devtools/client/memory/panel.js
index 71728b300533..bf647b414949 100644
--- a/devtools/client/memory/panel.js
+++ b/devtools/client/memory/panel.js
@@ -8,9 +8,10 @@ const EventEmitter = require("devtools/shared/event-emitter");
 const { Cu } = require("chrome");
 const HeapAnalysesClient = require("devtools/shared/heapsnapshot/HeapAnalysesClient");
 
-function MemoryPanel(iframeWindow, toolbox) {
+function MemoryPanel(iframeWindow, toolbox, commands) {
   this.panelWin = iframeWindow;
   this._toolbox = toolbox;
+  this._commands = commands;
 
   const { BrowserLoader } = Cu.import(
     "resource://devtools/client/shared/browser-loader.js"
diff --git a/devtools/client/netmonitor/panel.js b/devtools/client/netmonitor/panel.js
index 5c0af88a0ed0..e047892504fd 100644
--- a/devtools/client/netmonitor/panel.js
+++ b/devtools/client/netmonitor/panel.js
@@ -4,9 +4,10 @@
 
 "use strict";
 
-function NetMonitorPanel(iframeWindow, toolbox) {
+function NetMonitorPanel(iframeWindow, toolbox, commands) {
   this.panelWin = iframeWindow;
   this.toolbox = toolbox;
+  this.commands = commands;
 }
 
 NetMonitorPanel.prototype = {
diff --git a/devtools/client/performance-new/panel.js b/devtools/client/performance-new/panel.js
index 2a6394942abb..317a41cccb91 100644
--- a/devtools/client/performance-new/panel.js
+++ b/devtools/client/performance-new/panel.js
@@ -21,10 +21,12 @@ class PerformancePanel {
   /**
    * @param {PanelWindow} iframeWindow
    * @param {Toolbox} toolbox
+   * @param {Object} commands
    */
-  constructor(iframeWindow, toolbox) {
+  constructor(iframeWindow, toolbox, commands) {
     this.panelWin = iframeWindow;
     this.toolbox = toolbox;
+    this.commands = commands;
 
     const EventEmitter = require("devtools/shared/event-emitter");
     EventEmitter.decorate(this);
diff --git a/devtools/client/performance/panel.js b/devtools/client/performance/panel.js
index 28fef793f027..594825e66a17 100644
--- a/devtools/client/performance/panel.js
+++ b/devtools/client/performance/panel.js
@@ -5,9 +5,10 @@
 
 loader.lazyRequireGetter(this, "EventEmitter", "devtools/shared/event-emitter");
 
-function PerformancePanel(iframeWindow, toolbox) {
+function PerformancePanel(iframeWindow, toolbox, commands) {
   this.panelWin = iframeWindow;
   this.toolbox = toolbox;
+  this.commands = commands;
   this._targetAvailablePromise = Promise.resolve();
 
   this._onTargetAvailable = this._onTargetAvailable.bind(this);
diff --git a/devtools/client/storage/panel.js b/devtools/client/storage/panel.js
index 3e04c7bb548d..41038b85cd37 100644
--- a/devtools/client/storage/panel.js
+++ b/devtools/client/storage/panel.js
@@ -9,10 +9,11 @@ const EventEmitter = require("devtools/shared/event-emitter");
 loader.lazyRequireGetter(this, "StorageUI", "devtools/client/storage/ui", true);
 
 class StoragePanel {
-  constructor(panelWin, toolbox) {
+  constructor(panelWin, toolbox, commands) {
     EventEmitter.decorate(this);
 
     this._toolbox = toolbox;
+    this._commands = commands;
     this._panelWin = panelWin;
 
     this.destroy = this.destroy.bind(this);
@@ -26,7 +27,7 @@ class StoragePanel {
    * open is effectively an asynchronous constructor
    */
   async open() {
-    this.UI = new StorageUI(this._panelWin, this._toolbox);
+    this.UI = new StorageUI(this._panelWin, this._toolbox, this._commands);
 
     await this.UI.init();
 
diff --git a/devtools/client/storage/ui.js b/devtools/client/storage/ui.js
index fbb2f2701166..3b14ed92e41b 100644
--- a/devtools/client/storage/ui.js
+++ b/devtools/client/storage/ui.js
@@ -109,13 +109,16 @@ const NON_ORIGINAL_L10N_IDS = new Map([
  *
  * @param {Window} panelWin
  *        Window of the toolbox panel to populate UI in.
+ * @param {Object} commands
+ *        The commands object with all interfaces defined from devtools/shared/commands/
  */
 class StorageUI {
-  constructor(panelWin, toolbox) {
+  constructor(panelWin, toolbox, commands) {
     EventEmitter.decorate(this);
     this._window = panelWin;
     this._panelDoc = panelWin.document;
     this._toolbox = toolbox;
+    this._commands = commands;
     this.sidebarToggledOpen = null;
     this.shouldLoadMoreItems = true;
 
diff --git a/devtools/client/styleeditor/panel.js b/devtools/client/styleeditor/panel.js
index 004d68515ba0..740cbb816ef8 100644
--- a/devtools/client/styleeditor/panel.js
+++ b/devtools/client/styleeditor/panel.js
@@ -15,10 +15,11 @@ var {
   getString,
 } = require("resource://devtools/client/styleeditor/StyleEditorUtil.jsm");
 
-var StyleEditorPanel = function StyleEditorPanel(panelWin, toolbox) {
+var StyleEditorPanel = function StyleEditorPanel(panelWin, toolbox, commands) {
   EventEmitter.decorate(this);
 
   this._toolbox = toolbox;
+  this._commands = commands;
   this._panelWin = panelWin;
   this._panelDoc = panelWin.document;
 
diff --git a/devtools/client/webconsole/browser-console-manager.js b/devtools/client/webconsole/browser-console-manager.js
index e25e8ad7768f..22f19ec8e624 100644
--- a/devtools/client/webconsole/browser-console-manager.js
+++ b/devtools/client/webconsole/browser-console-manager.js
@@ -62,7 +62,8 @@ class BrowserConsoleManager {
    *         A promise object for the opening of the new BrowserConsole instance.
    */
   async openBrowserConsole(target, win) {
-    const hud = new BrowserConsole(target, win, win);
+    const commands = await target.descriptorFront.getCommands();
+    const hud = new BrowserConsole(target, commands, win, win);
     this._browserConsole = hud;
     await hud.init();
     return hud;
diff --git a/devtools/client/webconsole/browser-console.js b/devtools/client/webconsole/browser-console.js
index 171bd01a4da2..280c16542f98 100644
--- a/devtools/client/webconsole/browser-console.js
+++ b/devtools/client/webconsole/browser-console.js
@@ -41,10 +41,11 @@ class BrowserConsole extends WebConsole {
    * @param nsIDOMWindow chromeWindow
    *        The window of the browser console owner.
    */
-  constructor(target, iframeWindow, chromeWindow) {
-    super(null, iframeWindow, chromeWindow, true);
+  constructor(target, commands, iframeWindow, chromeWindow) {
+    super(null, commands, iframeWindow, chromeWindow, true);
 
     this._browserConsoleTarget = target;
+    this._descriptorFront = target.descriptorFront;
     this._targetList = new TargetList(target.descriptorFront);
     this._resourceWatcher = new ResourceWatcher(this._targetList);
     this._telemetry = new Telemetry();
diff --git a/devtools/client/webconsole/panel.js b/devtools/client/webconsole/panel.js
index f456e77501ba..4e376523485a 100644
--- a/devtools/client/webconsole/panel.js
+++ b/devtools/client/webconsole/panel.js
@@ -16,9 +16,10 @@ loader.lazyGetter(this, "EventEmitter", () =>
 /**
  * A DevToolPanel that controls the Web Console.
  */
-function WebConsolePanel(iframeWindow, toolbox) {
+function WebConsolePanel(iframeWindow, toolbox, commands) {
   this._frameWindow = iframeWindow;
   this._toolbox = toolbox;
+  this._commands = commands;
   EventEmitter.decorate(this);
 }
 
@@ -67,6 +68,7 @@ WebConsolePanel.prototype = {
       // Open the Web Console.
       this.hud = new WebConsole(
         this._toolbox,
+        this._commands,
         webConsoleUIWindow,
         chromeWindow
       );
diff --git a/devtools/client/webconsole/webconsole.js b/devtools/client/webconsole/webconsole.js
index fa19a6331533..12d3f3ebf516 100644
--- a/devtools/client/webconsole/webconsole.js
+++ b/devtools/client/webconsole/webconsole.js
@@ -54,14 +54,23 @@ class WebConsole {
    * @constructor
    * @param object toolbox
    *        The toolbox where the web console is displayed.
+   * @param object commands
+   *        The commands object with all interfaces defined from devtools/shared/commands/
    * @param nsIDOMWindow iframeWindow
    *        The window where the web console UI is already loaded.
    * @param nsIDOMWindow chromeWindow
    *        The window of the web console owner.
    * @param bool isBrowserConsole
    */
-  constructor(toolbox, iframeWindow, chromeWindow, isBrowserConsole = false) {
+  constructor(
+    toolbox,
+    commands,
+    iframeWindow,
+    chromeWindow,
+    isBrowserConsole = false
+  ) {
     this.toolbox = toolbox;
+    this.commands = commands;
     this.iframeWindow = iframeWindow;
     this.chromeWindow = chromeWindow;
     this.hudId = "hud_" + ++gHudId;
diff --git a/devtools/shared/commands/README.md b/devtools/shared/commands/README.md
new file mode 100644
index 000000000000..0cbeda1f2318
--- /dev/null
+++ b/devtools/shared/commands/README.md
@@ -0,0 +1,46 @@
+# Commands
+
+Commands are singletons, which can be easily used by any frontend code.
+They are meant to be exposed widely to the frontend so that any code can easily call any of their methods.
+
+Commands classes expose static methods, which:
+* route to the right Front/Actor's method
+* handle backward compatibility
+* map to many target's actor if needed
+
+These classes are instantiated once per descriptor
+and may have inner state, emit events, fire callbacks,...
+
+A transient backward compat need, required by Fission refactorings will be to have some code checking a trait, and either:
+* call a single method on a parent process actor (like BreakpointListActor.setBreakpoint)
+* otherwise, call a method on each target's scoped actor (like ThreadActor.setBreakpoint, that, for each available target)
+
+Without such layer, we would have to put such code here and there in the frontend code.
+This will be harder to remove later, once we get rid of old pre-fission-refactoring codepaths.
+
+This layer already exists in some panels, but we are using slightly different names and practices:
+* Debugger uses "client" (devtools/client/debugger/src/client/) and "commands" (devtools/client/debugger/src/client/firefox/commands.js)
+  Debugger's commands already bundle the code to dispatch an action to many target's actor.
+  They also contain some backward compat code.
+  Today, we pass around a `client` object via thunkArgs, which is mapped to commands.js,
+  instead we could pass a debugger command object.
+* Network Monitor uses "connector" (devtools/client/netmonitor/src/connector)
+  Connectors also bundles backward compat and dispatch to many target's actor.
+  Today, we pass the `connector` to all middlewares from configureStore,
+  we could instead pass the netmonitor command object.
+* Web Console has:
+  * WebConsoleConnectionProxy, but this is probably going to disappear and doesn't do much.
+  * WebConsoleUI, which does dispatch to many target's actor, via getAllProxies (see clearMessagesCache)
+  * See devtools/client/webconsole/actions/input.js:handleHelperResult(), where we have to put some code, which is a duplicate of Netmonitor Connector,
+    and could be shared via a netmonitor command class.
+* Inspector is probably the panel doing the most dispatch to many target's actor.
+  Codes using getAllInspectorFronts could all be migrated to an inspector command class:
+  https://searchfox.org/mozilla-central/search?q=symbol:%23getAllInspectorFronts&redirect=false
+  and simplify a bit the frontend.
+  It is also one panel, which still register listener to each target's inspector/walker fronts.
+  Because inspector isn't using resources.
+  But this work, registering listeners for each target might be done by such layer and translate the many actor's event into a unified one.
+
+Last, but not least, this layer may allow us to slowly get rid of protocol.js.
+Command classes aren't Fronts, nor are they particularly connected to protocol.js.
+If we make it so that all the Frontend code using Fronts uses Commands instead, we might more easily get away from protocol.js.
diff --git a/devtools/shared/commands/index.js b/devtools/shared/commands/index.js
new file mode 100644
index 000000000000..44a29d3851d4
--- /dev/null
+++ b/devtools/shared/commands/index.js
@@ -0,0 +1,48 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+// List of all command modules
+// (please try to keep the list alphabetically sorted)
+/*eslint sort-keys: "error"*/
+const Commands = {};
+
+/**
+ * For a given descriptor and its related Targets, already initialized,
+ * return the dictionary with all command instances.
+ * This dictionary is lazy and commands will be loaded and instanciated on-demand.
+ */
+async function createCommandsDictionary(descriptorFront) {
+  // Bug 1675763: Watcher actor is not available in all situations yet.
+  let watcherFront;
+  const supportsWatcher = descriptorFront.traits?.watcher;
+  if (supportsWatcher) {
+    watcherFront = await descriptorFront.getWatcher();
+  }
+  const dictionary = {};
+  for (const name in Commands) {
+    loader.lazyGetter(dictionary, name, () => {
+      const Constructor = require(Commands[name])[name];
+      return new Constructor({
+        // Commands can use other commands
+        commands: dictionary,
+
+        // The context to inspect identified by this descriptor
+        descriptorFront,
+
+        // The front for the Watcher Actor, related to the given descriptor
+        // This is a key actor to watch for targets and resources and pull global actors running in the parent process
+        watcherFront,
+
+        // From here, we could pass DevToolsClient, or any useful protocol classes...
+        // so that we abstract where and how to fetch all necessary interfaces
+        // and avoid having to know that you might pull the client via descriptorFront.client
+      });
+    });
+  }
+
+  return dictionary;
+}
+exports.createCommandsDictionary = createCommandsDictionary;
diff --git a/devtools/shared/commands/moz.build b/devtools/shared/commands/moz.build
new file mode 100644
index 000000000000..e1ca52aa96dc
--- /dev/null
+++ b/devtools/shared/commands/moz.build
@@ -0,0 +1,7 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+DevToolsModules(
+    "index.js",
+)
diff --git a/devtools/shared/moz.build b/devtools/shared/moz.build
index 04d8b0a25b31..048c8937016c 100644
--- a/devtools/shared/moz.build
+++ b/devtools/shared/moz.build
@@ -9,6 +9,7 @@ include("../templates.mozbuild")
 DIRS += [
     "acorn",
     "css",
+    "commands",
     "compatibility",
     "discovery",
     "heapsnapshot",