Bug 1685213 - Part 3: Record launch method telemetry. r=bytesized

Differential Revision: https://phabricator.services.mozilla.com/D106345

browser/components/BrowserGlue.jsm

@@ -2333,6 +2333,37 @@ BrowserGlue.prototype = {
         },
       },
 
+      // Report the type of shortcut used to launch
+      {
+        condition: AppConstants.platform == "win",
+        task: () => {
+          let classification;
+          let shortcut;
+          try {
+            shortcut = Services.appinfo.processStartupShortcut;
+            let shellService = Cc[
+              "@mozilla.org/browser/shell-service;1"
+            ].getService(Ci.nsIWindowsShellService);
+            classification = shellService.classifyShortcut(shortcut);
+          } catch (ex) {
+            Cu.reportError(ex);
+          }
+
+          if (!classification) {
+            if (shortcut) {
+              classification = "OtherShortcut";
+            } else {
+              classification = "Other";
+            }
+          }
+
+          Services.telemetry.scalarSet(
+            "os.environment.launch_method",
+            classification
+          );
+        },
+      },
+
       {
         condition: AppConstants.platform == "win",
         task: () => {

toolkit/components/telemetry/Scalars.yaml

@@ -1774,6 +1774,27 @@ os.environment:
     operating_systems:
       - "windows"
 
+  launch_method:
+    bug_numbers:
+      - 1685213
+    description: >
+      Records how Firefox was started on Windows.
+      Currently will be one of "Desktop", "StartMenu" (including pins),
+      "Taskbar", "OtherShortcut", or "Other"
+    expires: "94"
+    kind: string
+    notification_emails:
+      - application-update-telemetry-alerts@mozilla.com
+      - agashlin@mozilla.com
+      - shong@mozilla.com
+    release_channel_collection: opt-out
+    products:
+      - firefox
+    record_in_processes:
+      - main
+    operating_systems:
+      - windows
+
 pictureinpicture:
   opened_method:
     bug_numbers: