Test WEE that changes a pref using an experimental API.

Based on prior work in the Shield Studies Addon Template repo (mozilla/shield-studies-addon-template#55) and Shield Studies Addon Utils repo (mozilla/shield-studies-addon-utils#120).

This was just a proof-of-concept for me to understand the basics of creating experimental APIs for use in WebExtension Experiments (WEEs).

This WEE simply sets the "browser.privatebrowsing.autostart" boolean preference to "true" via an experimental "prefchange" WebExtension API.

.gitignore

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+node_modules
+src/privileged/shieldUtils/jsm/StudyUtils.jsm
+src/privileged/shieldUtils/jsm/PioneerUtils.jsm

background.js

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+"use strict";
+
+// call a method from the experimental API
+browser.prefchange.setBoolPref("browser.privatebrowsing.autostart", true);

manifest.json

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+{
+
+  "manifest_version": 2,
+  "name": "Shield Study WebExtension Experiment",
+  "version": "1.0",
+
+  "description": "A Shield Study WebExtension Experiment to change a preference in Firefox.",
+
+  "applications": {
+    "gecko": {
+      "id": "[email protected]",
+      "strict_min_version": "59.0"
+    }
+  },
+
+  "background": {
+  "scripts": ["background.js"]
+  },
+
+  "experiment_apis": {
+    "study": {
+      "schema": "./privileged/study/schema.json",
+      "parent": {
+        "scopes": ["addon_parent"],
+        "script": "./privileged/study/api.js",
+        "paths": [["study"]]
+      }
+    },
+    "prefchange": {
+      "schema": "./privileged/prefchange/schema.json",
+      "parent": {
+        "scopes": ["addon_parent"],
+        "script": "./privileged/prefchange/api.js",
+        "paths": [["prefchange"]]
+      }
+    }
+  }
+
+}