make cloud storage support optional

(currently not supported on FF-webext and MS Edge)

src/css/dashboard-common.css

@@ -37,7 +37,9 @@ div > p:last-child {
 input[type="number"] {
     width: 5em;
     }
-
+input[type="checkbox"][disabled] + label {
+    opacity: 0.4;
+    }
 .para {
     width: 40em;
     }

src/js/messaging.js

@@ -648,16 +648,18 @@ vAPI.messaging.listen('elementPicker', onMessage);
 
 /******************************************************************************/
 
-var µb = µBlock;
-
-/******************************************************************************/
-
 var onMessage = function(request, sender, callback) {
+    // Cloud storage support is optional.
+    if ( vAPI.cloud instanceof Object === false ) {
+        callback();
+        return;
+    }
+
     // Async
     switch ( request.what ) {
     case 'cloudGetOptions':
         vAPI.cloud.getOptions(function(options) {
-            options.enabled = µb.userSettings.cloudStorageEnabled === true;
+            options.enabled = µBlock.userSettings.cloudStorageEnabled === true;
             callback(options);
         });
         return;
@@ -722,7 +724,8 @@ var getLocalData = function(callback) {
             lastRestoreFile: o.lastRestoreFile,
             lastRestoreTime: o.lastRestoreTime,
             lastBackupFile: o.lastBackupFile,
-            lastBackupTime: o.lastBackupTime
+            lastBackupTime: o.lastBackupTime,
+            cloudStorageSupported: vAPI.cloud instanceof Object
         });
     };
 

src/js/settings.js

@@ -138,6 +138,10 @@ var onLocalDataReceived = function(details) {
         uDom('#localData > ul > li:nth-of-type(3) > ul > li:nth-of-type(2)').text(lastRestoreFile);
         uDom('#localData > ul > li:nth-of-type(3)').css('display', '');
     }
+
+    if ( details.cloudStorageSupported === false ) {
+        uDom('#cloud-storage-enabled').attr('disabled', '');
+    }
 };
 
 /******************************************************************************/

src/js/start.js

@@ -67,12 +67,15 @@ var onAllReady = function() {
     // for launch time.
     µb.assets.remoteFetchBarrier -= 1;
 
-    vAPI.cloud.start([
-        'tpFiltersPane',
-        'myFiltersPane',
-        'myRulesPane',
-        'whitelistPane'
-    ]);
+    // vAPI.cloud is optional.
+    if ( vAPI.cloud instanceof Object ) {
+        vAPI.cloud.start([
+            'tpFiltersPane',
+            'myFiltersPane',
+            'myRulesPane',
+            'whitelistPane'
+        ]);
+    }
 
     //quickProfiler.stop(0);