diff --git a/devtools/client/application/test/browser.ini b/devtools/client/application/test/browser.ini
index f5e5f31e7fc5..aae729fbf96d 100644
--- a/devtools/client/application/test/browser.ini
+++ b/devtools/client/application/test/browser.ini
@@ -12,6 +12,7 @@ support-files =
   service-workers/simple.html
   service-workers/simple-unicode.html
   !/devtools/client/debugger/new/test/mochitest/helpers.js
+  !/devtools/client/debugger/new/test/mochitest/helpers/context.js
   !/devtools/client/shared/test/frame-script-utils.js
   !/devtools/client/shared/test/shared-head.js
   !/devtools/client/shared/test/telemetry-test-helpers.js
diff --git a/devtools/client/application/test/browser_application_panel_debug-service-worker.js b/devtools/client/application/test/browser_application_panel_debug-service-worker.js
index 6283b62a133b..d73e25bfc417 100644
--- a/devtools/client/application/test/browser_application_panel_debug-service-worker.js
+++ b/devtools/client/application/test/browser_application_panel_debug-service-worker.js
@@ -8,6 +8,11 @@ Services.scriptloader.loadSubScript(
   "chrome://mochitests/content/browser/devtools/client/debugger/new/test/mochitest/helpers.js",
   this);
 
+/* import-globals-from ../../debugger/new/test/mochitest/helpers/context.js */
+Services.scriptloader.loadSubScript(
+  "chrome://mochitests/content/browser/devtools/client/debugger/new/test/mochitest/helpers/context.js",
+  this);
+
 const TAB_URL = URL_ROOT + "service-workers/debug.html";
 
 add_task(async function() {
diff --git a/devtools/client/canvasdebugger/test/browser.ini b/devtools/client/canvasdebugger/test/browser.ini
index 7139680c29a0..7149df2e2088 100644
--- a/devtools/client/canvasdebugger/test/browser.ini
+++ b/devtools/client/canvasdebugger/test/browser.ini
@@ -17,6 +17,7 @@ support-files =
   head.js
   !/devtools/client/shared/test/frame-script-utils.js
   !/devtools/client/shared/test/shared-head.js
+  !/devtools/client/debugger/new/test/mochitest/helpers/context.js
   !/devtools/client/shared/test/telemetry-test-helpers.js
 
 [browser_canvas-actor-test-01.js]
diff --git a/devtools/client/canvasdebugger/test/browser_canvas-frontend-call-stack-01.js b/devtools/client/canvasdebugger/test/browser_canvas-frontend-call-stack-01.js
index eac69542e0e4..880e4887ede6 100644
--- a/devtools/client/canvasdebugger/test/browser_canvas-frontend-call-stack-01.js
+++ b/devtools/client/canvasdebugger/test/browser_canvas-frontend-call-stack-01.js
@@ -5,11 +5,7 @@
  * Tests if the a function call's stack is properly displayed in the UI.
  */
 
-// Force the old debugger UI since it's directly used (see Bug 1301705)
-Services.prefs.setBoolPref("devtools.debugger.new-debugger-frontend", false);
-registerCleanupFunction(function() {
-  Services.prefs.clearUserPref("devtools.debugger.new-debugger-frontend");
-});
+requestLongerTimeout(2);
 
 async function ifTestingSupported() {
   const { target, panel } = await initCanvasDebuggerFrontend(SIMPLE_CANVAS_DEEP_STACK_URL);
@@ -70,12 +66,8 @@ async function ifTestingSupported() {
   await jumpedToSource;
 
   const toolbox = await gDevTools.getToolbox(target);
-  const { panelWin: { DebuggerView: view } } = toolbox.getPanel("jsdebugger");
-
-  is(view.Sources.selectedValue, getSourceActor(view.Sources, SIMPLE_CANVAS_DEEP_STACK_URL),
-    "The expected source was shown in the debugger.");
-  is(view.editor.getCursor().line, 25,
-    "The expected source line is highlighted in the debugger.");
+  const dbg = createDebuggerContext(toolbox);
+  await validateDebuggerLocation(dbg, SIMPLE_CANVAS_DEEP_STACK_URL, 26);
 
   await teardown(panel);
   finish();
diff --git a/devtools/client/canvasdebugger/test/browser_canvas-frontend-call-stack-02.js b/devtools/client/canvasdebugger/test/browser_canvas-frontend-call-stack-02.js
index 5314d8da146e..4434eb125c99 100644
--- a/devtools/client/canvasdebugger/test/browser_canvas-frontend-call-stack-02.js
+++ b/devtools/client/canvasdebugger/test/browser_canvas-frontend-call-stack-02.js
@@ -6,11 +6,7 @@
  * and jumping to source in the debugger for the topmost call item works.
  */
 
-// Force the old debugger UI since it's directly used (see Bug 1301705)
-Services.prefs.setBoolPref("devtools.debugger.new-debugger-frontend", false);
-registerCleanupFunction(function() {
-  Services.prefs.clearUserPref("devtools.debugger.new-debugger-frontend");
-});
+requestLongerTimeout(2);
 
 async function ifTestingSupported() {
   const { target, panel } = await initCanvasDebuggerFrontend(SIMPLE_CANVAS_DEEP_STACK_URL);
@@ -45,12 +41,8 @@ async function ifTestingSupported() {
   await jumpedToSource;
 
   const toolbox = await gDevTools.getToolbox(target);
-  const { panelWin: { DebuggerView: view } } = toolbox.getPanel("jsdebugger");
-
-  is(view.Sources.selectedValue, getSourceActor(view.Sources, SIMPLE_CANVAS_DEEP_STACK_URL),
-    "The expected source was shown in the debugger.");
-  is(view.editor.getCursor().line, 23,
-    "The expected source line is highlighted in the debugger.");
+  const dbg = createDebuggerContext(toolbox);
+  await validateDebuggerLocation(dbg, SIMPLE_CANVAS_DEEP_STACK_URL, 24);
 
   await teardown(panel);
   finish();
diff --git a/devtools/client/canvasdebugger/test/head.js b/devtools/client/canvasdebugger/test/head.js
index 5dcc536abd40..15e50578a6b7 100644
--- a/devtools/client/canvasdebugger/test/head.js
+++ b/devtools/client/canvasdebugger/test/head.js
@@ -3,6 +3,7 @@
 
 /* eslint no-unused-vars: [2, {"vars": "local"}] */
 /* import-globals-from ../../shared/test/shared-head.js */
+/* import-globals-from ../../debugger/new/test/mochitest/helpers/context.js */
 
 "use strict";
 
@@ -11,6 +12,11 @@ Services.scriptloader.loadSubScript(
   "chrome://mochitests/content/browser/devtools/client/shared/test/shared-head.js",
   this);
 
+// Import helpers for the new debugger
+Services.scriptloader.loadSubScript(
+  "chrome://mochitests/content/browser/devtools/client/debugger/new/test/mochitest/helpers/context.js",
+  this);
+
 var { generateUUID } = Cc["@mozilla.org/uuid-generator;1"].getService(Ci.nsIUUIDGenerator);
 
 var { DebuggerClient } = require("devtools/shared/client/debugger-client");
@@ -173,3 +179,13 @@ function getSourceActor(aSources, aURL) {
   const item = aSources.getItemForAttachment(a => a.source.url === aURL);
   return item ? item.value : null;
 }
+
+async function validateDebuggerLocation(dbg, url, line) {
+  const location = dbg.selectors.getSelectedLocation(dbg.getState());
+  const sourceUrl = dbg.selectors.getSelectedSource(dbg.getState()).url;
+
+  is(sourceUrl, url,
+    "The expected source was shown in the debugger.");
+  is(location.line, line,
+    "The expected source line is highlighted in the debugger.");
+}
diff --git a/devtools/client/debugger/new/test/mochitest/helpers.js b/devtools/client/debugger/new/test/mochitest/helpers.js
index abfbda51ae30..a958baf0e21b 100644
--- a/devtools/client/debugger/new/test/mochitest/helpers.js
+++ b/devtools/client/debugger/new/test/mochitest/helpers.js
@@ -6,6 +6,11 @@
  * required from other panel test files.
  */
 
+// Import helpers for the new debugger
+Services.scriptloader.loadSubScript(
+  "chrome://mochitests/content/browser/devtools/client/debugger/new/test/mochitest/helpers/context.js",
+  this);
+
 var { Toolbox } = require("devtools/client/framework/toolbox");
 var { Task } = require("devtools/shared/task");
 var asyncStorage = require("devtools/shared/async-storage");
@@ -462,23 +467,6 @@ function isSelectedFrameSelected(dbg, state) {
   return source.id == sourceId;
 }
 
-function createDebuggerContext(toolbox) {
-  const panel = toolbox.getPanel("jsdebugger");
-  const win = panel.panelWin;
-  const { store, client, selectors, actions } = panel.getVarsForTests();
-
-  return {
-    actions: actions,
-    selectors: selectors,
-    getState: store.getState,
-    store: store,
-    client: client,
-    toolbox: toolbox,
-    win: win,
-    panel: panel
-  };
-}
-
 /**
  * Clear all the debugger related preferences.
  */
diff --git a/devtools/client/inspector/markup/test/browser.ini b/devtools/client/inspector/markup/test/browser.ini
index 8fb39cdf965a..92890a526efd 100644
--- a/devtools/client/inspector/markup/test/browser.ini
+++ b/devtools/client/inspector/markup/test/browser.ini
@@ -70,6 +70,7 @@ support-files =
   lib_react_with_addons_15.4.1.js
   react_external_listeners.js
   !/devtools/client/debugger/new/test/mochitest/helpers.js
+  !/devtools/client/debugger/new/test/mochitest/helpers/context.js
   !/devtools/client/inspector/test/head.js
   !/devtools/client/inspector/test/shared-head.js
   !/devtools/client/shared/test/shared-head.js
diff --git a/devtools/client/inspector/markup/test/browser_markup_shadowdom_open_debugger.js b/devtools/client/inspector/markup/test/browser_markup_shadowdom_open_debugger.js
index f40cdbefd607..75b943dc4518 100644
--- a/devtools/client/inspector/markup/test/browser_markup_shadowdom_open_debugger.js
+++ b/devtools/client/inspector/markup/test/browser_markup_shadowdom_open_debugger.js
@@ -15,6 +15,11 @@ Services.scriptloader.loadSubScript(
   "chrome://mochitests/content/browser/devtools/client/debugger/new/test/mochitest/helpers.js",
   this);
 
+/* import-globals-from ../../../debugger/new/test/mochitest/helpers/context.js */
+Services.scriptloader.loadSubScript(
+  "chrome://mochitests/content/browser/devtools/client/debugger/new/test/mochitest/helpers/context.js",
+  this);
+
 const TEST_URL = `data:text/html;charset=utf-8,` + encodeURIComponent(`
 <test-component></test-component>
 <other-component>some-content</other-component>