Implement add-on setting persistance

chrome/js/settings.js

@@ -18,7 +18,7 @@ window.onload = function () {
 
         let previousValue, currentValue;
 
-        previousValue = target.getAttribute('data-previous-value') || '';
+        previousValue = target.getAttribute('data-previous-value') || null;
         currentValue = target.value;
 
         sharedFunctions.applySetting({

package.json

@@ -6,6 +6,13 @@
   "id": "tor-browser-settings@torproject.org",
   "main": "src/main.js",
   "author": "Thomas Rientjes",
+  "preferences": [{
+    "name": "security_level",
+    "title": "Tor browser security level",
+    "hidden": true,
+    "type": "integer",
+    "value": 0
+  }],
   "permissions": {
     "private-browsing": true
   },

src/settings.js

@@ -97,7 +97,7 @@ function startListening (worker) {
             learn_more_label: _('learn_more_label')
         },
         settings: {
-            security_level: new Setting('security_level', 2)
+            security_level: new Setting('security_level', settings['security_level'])
         }
     });
 
@@ -111,9 +111,9 @@ function startListening (worker) {
 
     worker.port.on('setting:altered', function (settingAlteration) {
 
-        settings[settingAlteration.settingId] = settingAlteration.currentValue;
+        settings[settingAlteration.settingId] = parseInt(settingAlteration.currentValue);
 
-        var persistedSetting = new Setting(settingAlteration.settingId, settingAlteration.currentValue);
+        let persistedSetting = new Setting(settingAlteration.settingId, settingAlteration.currentValue);
         worker.port.emit('setting:persisted', persistedSetting);
     });
 }