use insertCSS in FF, declarativeContent in Chrome

background/background.js

@@ -12,10 +12,11 @@ var browserCommands, contextMenus;
 chrome.runtime.onMessage.addListener(onRuntimeMessage);
 
 {
-  const listener =
+  const [listener] = [
-    URLS.chromeProtectsNTP
+    [webNavigationListenerChrome, CHROME],
-      ? webNavigationListenerChrome
+    [webNavigationListenerFF, FIREFOX],
-      : webNavigationListener;
+    [webNavigationListener, true],
+  ].find(([, selected]) => selected);
 
   chrome.webNavigation.onBeforeNavigate.addListener(data =>
     listener(null, data));
@@ -44,7 +45,6 @@ if (chrome.contextMenus) {
   chrome.contextMenus.onClicked.addListener((info, tab) =>
     contextMenus[info.menuItemId].click(info, tab));
 }
-
 if (chrome.commands) {
   // Not available in Firefox - https://bugzilla.mozilla.org/show_bug.cgi?id=1240350
   chrome.commands.onCommand.addListener(command => browserCommands[command]());
@@ -81,6 +81,24 @@ prefs.subscribe(['iconset'], () => updateIcon({id: undefined}, {}));
         browserUIlanguage: chrome.i18n.getUILanguage(),
       });
     }
+    if (!FIREFOX && chrome.declarativeContent) {
+      chrome.declarativeContent.onPageChanged.removeRules(null, () => {
+        chrome.declarativeContent.onPageChanged.addRules([{
+          conditions: [
+            new chrome.declarativeContent.PageStateMatcher({
+              pageUrl: {urlContains: ':'},
+            })
+          ],
+          actions: [
+            new chrome.declarativeContent.RequestContentScript({
+              js: ['/content/apply.js'],
+              allFrames: true,
+              matchAboutBlank: true,
+            }),
+          ],
+        }]);
+      });
+    }
   };
   // bind for 60 seconds max and auto-unbind if it's a normal run
   chrome.runtime.onInstalled.addListener(onInstall);
@@ -178,6 +196,15 @@ window.addEventListener('storageReady', function _() {
   const NTP = 'chrome://newtab/';
   const ALL_URLS = '<all_urls>';
   const contentScripts = chrome.runtime.getManifest().content_scripts;
+  if (!FIREFOX) {
+    contentScripts.push({
+      js: ['content/apply.js'],
+      matches: ['<all_urls>'],
+      run_at: 'document_start',
+      match_about_blank: true,
+      all_frames: true
+    });
+  }
   // expand * as .*?
   const wildcardAsRegExp = (s, flags) => new RegExp(
       s.replace(/[{}()[\]/\\.+?^$:=!|]/g, '\\$&')
@@ -210,8 +237,18 @@ window.addEventListener('storageReady', function _() {
 
   queryTabs().then(tabs =>
     tabs.forEach(tab => {
-      // skip lazy-loaded aka unloaded tabs that seem to start loading on message in FF
+      if (FIREFOX) {
-      if (!FIREFOX || tab.width) {
+        const tabId = tab.id;
+        const frameUrls = {'0': tab.url};
+        styleViaAPI.allFrameUrls.set(tabId, frameUrls);
+        chrome.webNavigation.getAllFrames({tabId}, frames => frames &&
+          frames.forEach(({frameId, parentFrameId, url}) => {
+            if (frameId) {
+              frameUrls[frameId] = url === 'about:blank' ? frameUrls[parentFrameId] : url;
+            }
+          }));
+      } else if (tab.width) {
+        // skip lazy-loaded aka unloaded tabs that seem to start loading on message
         contentScripts.forEach(cs =>
           setTimeout(pingCS, 0, cs, tab));
       }
@@ -243,18 +280,44 @@ function webNavigationListener(method, {url, tabId, frameId}) {
 
 
 function webNavigationListenerChrome(method, data) {
-  // Chrome 61.0.3161+ doesn't run content scripts on NTP
+  const {tabId, frameId, url} = data;
-  if (
+  if (url.startsWith('https://www.google.') && url.includes('/_/chrome/newtab?')) {
-    !data.url.startsWith('https://www.google.') ||
+    // Chrome 61.0.3161+ doesn't run content scripts on NTP
-    !data.url.includes('/_/chrome/newtab?')
+    getTab(tabId).then(tab => {
-  ) {
+      data.url = tab.url === 'chrome://newtab/' ? tab.url : url;
+      webNavigationListener(method, data);
+    });
+  } else {
+    webNavigationListener(method, data);
+    // chrome.declarativeContent doesn't inject scripts in about:blank iframes
+    if (method && frameId && url === 'about:blank') {
+      chrome.tabs.executeScript(tabId, {
+        file: '/content/apply.js',
+        runAt: 'document_start',
+        matchAboutBlank: true,
+        frameId,
+      }, ignoreChromeError);
+    }
+  }
+}
+
+
+function webNavigationListenerFF(method, data) {
+  const {tabId, frameId, url} = data;
+  if (url !== 'about:blank' || !frameId) {
+    styleViaAPI.setFrameUrl(tabId, frameId, url);
     webNavigationListener(method, data);
     return;
   }
-  getTab(data.tabId).then(tab => {
+  const frames = styleViaAPI.allFrameUrls.get(tabId);
-    if (tab.url === 'chrome://newtab/') {
+  if (Object.keys(frames).length === 1) {
-      data.url = tab.url;
+    frames[frameId] = frames['0'];
-    }
+    webNavigationListener(method, data);
+    return;
+  }
+  chrome.webNavigation.getFrame({tabId, frameId}, info => {
+    const hasParent = !chrome.runtime.lastError && info.parentFrameId >= 0;
+    frames[frameId] = hasParent ? frames[info.parentFrameId] : url;
     webNavigationListener(method, data);
   });
 }
@@ -262,13 +325,10 @@ function webNavigationListenerChrome(method, data) {
 
 function webNavUsercssInstallerFF(data) {
   const {tabId} = data;
-  Promise.all([
+  // we need tab index to open the installer next to the original one
-    sendMessage({tabId, method: 'ping'}),
+  // and also to skip the double-invocation in FF which assigns tab url later
-    // we need tab index to open the installer next to the original one
+  getTab(tabId).then(tab => {
-    // and also to skip the double-invocation in FF which assigns tab url later
+    if (tab.url !== 'about:blank') {
-    getTab(tabId),
-  ]).then(([pong, tab]) => {
-    if (pong !== true && tab.url !== 'about:blank') {
       usercssHelper.openInstallPage(tab, {direct: true});
     }
   });
@@ -367,10 +427,6 @@ function onRuntimeMessage(request, sender, sendResponseInternal) {
         .catch(() => sendResponse(false));
       return KEEP_CHANNEL_OPEN;
 
-    case 'styleViaAPI':
-      styleViaAPI(request, sender);
-      return;
-
     case 'download':
       download(request.url)
         .then(sendResponse)

background/style-via-api.js

@@ -1,7 +1,8 @@
 /* global getStyles */
 'use strict';
 
-const styleViaAPI = !CHROME && (() => {
+// eslint-disable-next-line no-var
+var styleViaAPI = !CHROME && (() => {
   const ACTIONS = {
     styleApply,
     styleDeleted,
@@ -9,8 +10,10 @@ const styleViaAPI = !CHROME && (() => {
     styleAdded,
     styleReplaceAll,
     prefChanged,
+    ping,
   };
   const NOP = Promise.resolve(new Error('NOP'));
+  const PONG = Promise.resolve(true);
   const onError = () => {};
 
   /* <tabId>: Object
@@ -19,18 +22,46 @@ const styleViaAPI = !CHROME && (() => {
          <styleId>: Array of strings
            section code */
   const cache = new Map();
+  const allFrameUrls = new Map();
 
   let observingTabs = false;
 
-  return (request, sender) => {
+  return {
-    const action = ACTIONS[request.action];
+    process,
-    return !action ? NOP :
+    getFrameUrl,
-      action(request, sender)
+    setFrameUrl,
-        .catch(onError)
+    allFrameUrls,
-        .then(maybeToggleObserver);
+    cache,
   };
 
-  function styleApply({id = null, ignoreUrlCheck}, {tab, frameId, url}) {
+  function process(request, sender) {
+    const action = ACTIONS[request.action || request.method];
+    if (!action) {
+      return NOP;
+    }
+    const {frameId, tab: {id: tabId}} = sender;
+    if (isNaN(frameId)) {
+      const frameIds = Object.keys(allFrameUrls.get(tabId) || {});
+      if (frameIds.length > 1) {
+        return Promise.all(
+          frameIds.map(frameId =>
+            process(request, Object.assign({}, sender, {frameId: Number(frameId)}))));
+      }
+      sender.frameId = 0;
+    }
+    return action(request, sender)
+      .catch(onError)
+      .then(maybeToggleObserver);
+  }
+
+  function styleApply({
+    id = null,
+    ignoreUrlCheck,
+  }, {
+    tab,
+    frameId,
+    url = getFrameUrl(tab.id, frameId),
+  }) {
     if (prefs.get('disableAll')) {
       return NOP;
     }
@@ -64,22 +95,20 @@ const styleViaAPI = !CHROME && (() => {
             matchAboutBlank: true,
           }).catch(onError));
       }
-      if (!removeFrameIfEmpty(tab.id, frameId, tabFrames, frameStyles)) {
+      Object.defineProperty(frameStyles, 'url', {value: url, configurable: true});
-        Object.defineProperty(frameStyles, 'url', {value: url, configurable: true});
+      tabFrames[frameId] = frameStyles;
-        tabFrames[frameId] = frameStyles;
+      cache.set(tab.id, tabFrames);
-        cache.set(tab.id, tabFrames);
-      }
       return Promise.all(tasks);
     });
   }
 
   function styleDeleted({id}, {tab, frameId}) {
-    const {tabFrames, frameStyles, styleSections} = getCachedData(tab.id, frameId, id);
+    const {frameStyles, styleSections} = getCachedData(tab.id, frameId, id);
     const code = styleSections.join('\n');
     if (code && !duplicateCodeExists({frameStyles, id, code})) {
-      delete frameStyles[id];
+      return removeCSS(tab.id, frameId, code).then(() => {
-      removeFrameIfEmpty(tab.id, frameId, tabFrames, frameStyles);
+        delete frameStyles[id];
-      return removeCSS(tab.id, frameId, code);
+      });
     } else {
       return NOP;
     }
@@ -125,7 +154,7 @@ const styleViaAPI = !CHROME && (() => {
       if (isEmpty(frameStyles)) {
         return NOP;
       }
-      removeFrameIfEmpty(tab.id, frameId, tabFrames, {});
+      delete tabFrames[frameId];
       const tasks = Object.keys(frameStyles)
         .map(id => removeCSS(tab.id, frameId, frameStyles[id].join('\n')));
       return Promise.all(tasks);
@@ -134,21 +163,26 @@ const styleViaAPI = !CHROME && (() => {
     }
   }
 
+  function ping() {
+    return PONG;
+  }
+
   /* utilities */
 
-  function maybeToggleObserver() {
+  function maybeToggleObserver(passthru) {
     let method;
     if (!observingTabs && cache.size) {
       method = 'addListener';
     } else if (observingTabs && !cache.size) {
       method = 'removeListener';
     } else {
-      return;
+      return passthru;
     }
     observingTabs = !observingTabs;
     chrome.webNavigation.onCommitted[method](onNavigationCommitted);
     chrome.tabs.onRemoved[method](onTabRemoved);
     chrome.tabs.onReplaced[method](onTabReplaced);
+    return passthru;
   }
 
   function onNavigationCommitted({tabId, frameId}) {
@@ -157,7 +191,7 @@ const styleViaAPI = !CHROME && (() => {
       return;
     }
     const tabFrames = cache.get(tabId);
-    if (frameId in tabFrames) {
+    if (tabFrames && frameId in tabFrames) {
       delete tabFrames[frameId];
       if (isEmpty(tabFrames)) {
         onTabRemoved(tabId);
@@ -174,16 +208,6 @@ const styleViaAPI = !CHROME && (() => {
     onTabRemoved(removedTabId);
   }
 
-  function removeFrameIfEmpty(tabId, frameId, tabFrames, frameStyles) {
-    if (isEmpty(frameStyles)) {
-      delete tabFrames[frameId];
-      if (isEmpty(tabFrames)) {
-        cache.delete(tabId);
-      }
-      return true;
-    }
-  }
-
   function getCachedData(tabId, frameId, styleId) {
     const tabFrames = cache.get(tabId) || {};
     const frameStyles = tabFrames[frameId] || {};
@@ -191,6 +215,20 @@ const styleViaAPI = !CHROME && (() => {
     return {tabFrames, frameStyles, styleSections};
   }
 
+  function getFrameUrl(tabId, frameId = 0) {
+    const frameUrls = allFrameUrls.get(tabId);
+    return frameUrls && frameUrls[frameId] || '';
+  }
+
+  function setFrameUrl(tabId, frameId, url) {
+    const frameUrls = allFrameUrls.get(tabId);
+    if (frameUrls) {
+      frameUrls[frameId] = url;
+    } else {
+      allFrameUrls.set(tabId, {[frameId]: url});
+    }
+  }
+
   function getFrameStylesJoined({
     tab,
     frameId,

content/apply.js

@@ -23,10 +23,6 @@
   }
 
   function requestStyles(options, callback = applyStyles) {
-    if (!chrome.app && document instanceof XMLDocument) {
-      chrome.runtime.sendMessage({method: 'styleViaAPI', action: 'styleApply'});
-      return;
-    }
     var matchUrl = location.href;
     if (!matchUrl.match(/^(http|file|chrome|ftp)/)) {
       // dynamic about: and javascript: iframes don't have an URL yet
@@ -63,17 +59,6 @@
       return;
     }
 
-    if (!chrome.app && document instanceof XMLDocument && request.method !== 'ping') {
-      request.action = request.method;
-      request.method = 'styleViaAPI';
-      request.styles = null;
-      if (request.style) {
-        request.style.sections = null;
-      }
-      chrome.runtime.sendMessage(request);
-      return;
-    }
-
     switch (request.method) {
       case 'styleDeleted':
         removeStyle(request);

js/messaging.js

@@ -150,6 +150,13 @@ function sendMessage(msg, callback) {
     - enabled by passing a second param
   */
   const {tabId, frameId} = msg;
+  if (tabId >= 0 && FIREFOX) {
+    // FF: reroute all tabs messages to styleViaAPI
+    const msgInBG = BG === window ? msg : BG.deepCopy(msg);
+    const sender = {tab: {id: tabId}, frameId};
+    const task = BG.styleViaAPI.process(msgInBG, sender);
+    return callback ? task.then(callback) : task;
+  }
   const fn = tabId >= 0 ? chrome.tabs.sendMessage : chrome.runtime.sendMessage;
   const args = tabId >= 0 ? [tabId, msg, {frameId}] : [msg];
   if (callback) {

manifest.json

@@ -16,6 +16,7 @@
     "webNavigation",
     "contextMenus",
     "storage",
+    "declarativeContent",
     "<all_urls>"
   ],
   "background": {
@@ -43,13 +44,6 @@
     }
   },
   "content_scripts": [
-    {
-      "matches": ["<all_urls>"],
-      "run_at": "document_start",
-      "all_frames": true,
-      "match_about_blank": true,
-      "js": ["content/apply.js"]
-    },
     {
       "matches": ["http://userstyles.org/*", "https://userstyles.org/*"],
       "run_at": "document_start",