this extends compatibility to FF-24-34

imported code from uBlock, including legacy toolbar support in 34485a0465,
which is itself directly based on work from @AlexVallat:
- 620a7d78d1
- d9b23d4f10
- 5ac4ec21e9

platform/firefox/css/legacy-toolbar-button.css

@@ -0,0 +1,46 @@
+#umatrix-legacy-button {
+    list-style-image: url('../img/browsericons/icon19-19.png');
+}
+#umatrix-legacy-button.off {
+    list-style-image: url('../img/browsericons/icon19-off.png');
+}
+
+toolbar[iconsize="small"] #umatrix-legacy-button {
+    list-style-image: url('../img/browsericons/icon19-19.png');
+}
+toolbar[iconsize="small"] #umatrix-legacy-button.off {
+    list-style-image: url('../img/browsericons/icon19-off.png');
+}
+#umatrix-legacy-button[badge]::before {
+    background: #000;
+    color: #fff;
+    content: attr(badge);
+    font: bold 10px sans-serif;
+    margin-top: -2px;
+    padding: 0 2px;
+    position: fixed;
+}
+/* This hack required because if the before content changes it de-pops the
+   popup (without firing any events). So just hide it instead. Note, can't
+   actually *hide* it, or the same thing happens.
+**/
+#umatrix-legacy-button[badge=""]::before {
+    padding: 0;
+}
+
+/* Override off state when in palette */
+toolbarpaletteitem #umatrix-legacy-button.off {
+    list-style-image: url('../img/browsericons/icon19-12.png');
+}
+
+/* Override badge when in palette */
+toolbarpaletteitem #umatrix-legacy-button[badge]::before {
+    content: none;
+}
+
+/* Prevent pale moon from showing the arrow underneath the button */
+/* https://github.com/chrisaljoudi/uBlock/issues/1449#issuecomment-112112761 */
+#umatrix-legacy-button .toolbarbutton-menu-dropmarker {
+    display: none;
+    -moz-box-orient: horizontal;
+}

platform/firefox/frameModule.js

@@ -38,13 +38,27 @@ const hostName = Services.io.newURI(Components.stack.filename, null, null).host;
 /******************************************************************************/
 
 const getMessageManager = function(win) {
-    return win
+    let iface = win
         .QueryInterface(Ci.nsIInterfaceRequestor)
         .getInterface(Ci.nsIDocShell)
         .sameTypeRootTreeItem
         .QueryInterface(Ci.nsIDocShell)
-        .QueryInterface(Ci.nsIInterfaceRequestor)
-        .getInterface(Ci.nsIContentFrameMessageManager);
+        .QueryInterface(Ci.nsIInterfaceRequestor);
+
+    try {
+        return iface.getInterface(Ci.nsIContentFrameMessageManager);
+    } catch (ex) {
+        // This can throw. It appears `shouldLoad` can be called *after*  a
+        // tab has been closed. For example, a case where this happens all
+        // the time (FF38):
+        // - Open twitter.com (assuming you have an account and are logged in)
+        // - Close twitter.com
+        // There will be an exception raised when `shouldLoad` is called
+        // to process a XMLHttpRequest with URL `https://twitter.com/i/jot`
+        // fired from `https://twitter.com/`, *after*  the tab is closed.
+        // In such case, `win` is `about:blank`.
+    }
+    return null;
 };
 
 /******************************************************************************/
@@ -56,6 +70,7 @@ const contentObserver = {
     ACCEPT: Ci.nsIContentPolicy.ACCEPT,
     MAIN_FRAME: Ci.nsIContentPolicy.TYPE_DOCUMENT,
     contentBaseURI: 'chrome://' + hostName + '/content/js/',
+    cpMessageName: hostName + ':shouldLoad',
     uniqueSandboxId: 1,
 
     get componentRegistrar() {
@@ -113,6 +128,51 @@ const contentObserver = {
 
     // https://bugzil.la/612921
     shouldLoad: function(type, location, origin, context) {
+        if ( Services === undefined ) {
+            return this.ACCEPT;
+        }
+
+        if ( !context ) {
+            return this.ACCEPT;
+        }
+
+        if ( !location.schemeIs('http') && !location.schemeIs('https') ) {
+            return this.ACCEPT;
+        }
+
+        var contextWindow;
+        if ( type === this.MAIN_FRAME ) {
+            contextWindow = context.contentWindow || context;
+        } else if ( type === this.SUB_FRAME ) {
+            contextWindow = context.contentWindow;
+        } else {
+            contextWindow = (context.ownerDocument || context).defaultView;
+        }
+
+        // The context for the toolbar popup is an iframe element here,
+        // so check context.top instead of context
+        if ( !contextWindow.top || !contextWindow.location ) {
+            return this.ACCEPT;
+        }
+
+        let messageManager = getMessageManager(contextWindow);
+        if ( messageManager === null ) {
+            return this.ACCEPT;
+        }
+
+        let details = {
+            rawType: type,
+            url: location.asciiSpec
+        };
+
+        if ( typeof messageManager.sendRpcMessage === 'function' ) {
+            // https://bugzil.la/1092216
+            messageManager.sendRpcMessage(this.cpMessageName, details);
+        } else {
+            // Compatibility for older versions
+            messageManager.sendSyncMessage(this.cpMessageName, details);
+        }
+
         return this.ACCEPT;
     },
 

platform/firefox/install.rdf

@@ -19,7 +19,7 @@
         <targetApplication>
             <r:Description>
                 <id>{{ec8030f7-c20a-464f-9b0e-13a3a9e97384}}</id>
-                <minVersion>35.0</minVersion>
+                <minVersion>24.0</minVersion>
                 <maxVersion>42.0</maxVersion>
             </r:Description>
         </targetApplication>

platform/firefox/vapi-common.js

@@ -128,12 +128,17 @@ vAPI.closePopup = function() {
 // experience.
 
 vAPI.localStorage = {
-    PB: Services.prefs.getBranch('extensions.' + location.host + '.'),
+    pbName: '',
+    pb: null,
     str: Components.classes['@mozilla.org/supports-string;1']
-        .createInstance(Components.interfaces.nsISupportsString),
+                   .createInstance(Components.interfaces.nsISupportsString),
+    init: function(pbName) {
+        this.pbName = pbName;
+        this.pb = Services.prefs.getBranch(pbName);
+    },
     getItem: function(key) {
         try {
-            return this.PB.getComplexValue(
+            return this.pb.getComplexValue(
                 key,
                 Components.interfaces.nsISupportsString
             ).data;
@@ -143,20 +148,35 @@ vAPI.localStorage = {
     },
     setItem: function(key, value) {
         this.str.data = value;
-        this.PB.setComplexValue(
+        this.pb.setComplexValue(
             key,
             Components.interfaces.nsISupportsString,
             this.str
         );
     },
+    getBool: function(key) {
+        try {
+            return this.pb.getBoolPref(key);
+        } catch (ex) {
+            return null;
+        }
+    },
+    setBool: function(key, value) {
+        this.pb.setBoolPref(key, value);
+    },
+    setDefaultBool: function(key, defaultValue) {
+        Services.prefs.getDefaultBranch(this.pbName).setBoolPref(key, defaultValue);
+    },
     removeItem: function(key) {
-        this.PB.clearUserPref(key);
+        this.pb.clearUserPref(key);
     },
     clear: function() {
-        this.PB.deleteBranch('');
+        this.pb.deleteBranch('');
     }
 };
 
+vAPI.localStorage.init('extensions.' + location.host + '.');
+
 /******************************************************************************/
 
 })();

tools/make-firefox.sh

@@ -15,6 +15,7 @@ cp    ./platform/firefox/vapi-*.js      $DES/js/
 cp    ./platform/firefox/bootstrap.js   $DES/
 cp    ./platform/firefox/frame*.js      $DES/
 cp -R ./platform/chromium/img           $DES/
+cp    ./platform/firefox/css/*          $DES/css/
 cp    ./platform/firefox/chrome.manifest $DES/
 cp    ./platform/firefox/install.rdf    $DES/
 cp    ./platform/firefox/*.xul          $DES/