better evaluate vAPI.webextFlavor

platform/chromium/vapi-background.js

@@ -33,26 +33,10 @@
 var chrome = self.chrome;
 var manifest = chrome.runtime.getManifest();
 
-vAPI.chrome = true;
-vAPI.chromiumVersion = (function(){
-    var matches = /\bChrom(?:e|ium)\/(\d+)\b/.exec(navigator.userAgent);
-    return matches !== null ? parseInt(matches[1], 10) : NaN;
-    })();
-
 vAPI.cantWebsocket =
     chrome.webRequest.ResourceType instanceof Object === false  ||
     chrome.webRequest.ResourceType.WEBSOCKET !== 'websocket';
 
-vAPI.webextFlavor = '';
-if (
-    self.browser instanceof Object &&
-    typeof self.browser.runtime.getBrowserInfo === 'function'
-) {
-    self.browser.runtime.getBrowserInfo().then(function(info) {
-        vAPI.webextFlavor = info.vendor + '-' + info.name + '-' + info.version;
-    });
-}
-
 // https://issues.adblockplus.org/ticket/5695
 // - Good idea, adopted: cleaner way to detect user-stylesheet support.
 vAPI.supportsUserStylesheets = 
@@ -1147,7 +1131,25 @@ vAPI.cloud = (function() {
     var maxChunkCountPerItem = Math.floor(512 * 0.75) & ~(chunkCountPerFetch - 1);
 
     // Mind chrome.storage.sync.QUOTA_BYTES_PER_ITEM (8192 at time of writing)
-    var maxChunkSize = chrome.storage.sync.QUOTA_BYTES_PER_ITEM || 8192;
+    // https://github.com/gorhill/uBlock/issues/3006
+    //  For Firefox, we will use a lower ratio to allow for more overhead for
+    //  the infrastructure. Unfortunately this leads to less usable space for
+    //  actual data, but all of this is provided for free by browser vendors,
+    //  so we need to accept and deal with these limitations.
+    var evalMaxChunkSize = function() {
+        return Math.floor(
+            (chrome.storage.sync.QUOTA_BYTES_PER_ITEM || 8192) *
+            (vAPI.webextFlavor.startsWith('Mozilla-Firefox-') ? 0.6 : 0.75)
+        );
+    };
+
+    var maxChunkSize = evalMaxChunkSize();
+
+    // The real actual webextFlavor value may not be set in stone, so listen
+    // for possible future changes.
+    window.addEventListener('webextFlavor', function() {
+        maxChunkSize = evalMaxChunkSize();
+    }, { once: true });
 
     // Mind chrome.storage.sync.QUOTA_BYTES (128 kB at time of writing)
     // Firefox:
@@ -1155,19 +1157,6 @@ vAPI.cloud = (function() {
     // > You can store up to 100KB of data using this API/
     var maxStorageSize = chrome.storage.sync.QUOTA_BYTES || 102400;
 
-    // Flavor-specific handling needs to be done here. Reason: to allow time
-    // for vAPI.webextFlavor to be properly set.
-    // https://github.com/gorhill/uBlock/issues/3006
-    //  For Firefox, we will use a lower ratio to allow for more overhead for
-    //  the infrastructure. Unfortunately this leads to less usable space for
-    //  actual data, but all of this is provided for free by browser vendors,
-    //  so we need to accept and deal with these limitations.
-    var initialize = function() {
-        var ratio = vAPI.webextFlavor.startsWith('Mozilla-Firefox-') ? 0.6 : 0.75;
-        maxChunkSize = Math.floor(maxChunkSize * ratio);
-        initialize = function(){};
-    };
-
     var options = {
         defaultDeviceName: window.navigator.platform,
         deviceName: vAPI.localStorage.getItem('deviceName') || ''
@@ -1226,7 +1215,6 @@ vAPI.cloud = (function() {
     };
 
     var push = function(dataKey, data, callback) {
-        initialize();
 
         var bin = {
             'source': options.deviceName || options.defaultDeviceName,
@@ -1271,7 +1259,6 @@ vAPI.cloud = (function() {
     };
 
     var pull = function(dataKey, callback) {
-        initialize();
 
         var assembleChunks = function(bin) {
             if ( chrome.runtime.lastError ) {

platform/chromium/vapi-common.js

@@ -36,6 +36,50 @@ vAPI.setTimeout = vAPI.setTimeout || self.setTimeout.bind(self);
 
 /******************************************************************************/
 
+vAPI.webextFlavor = (function() {
+    var ua = navigator.userAgent,
+        match, reEx;
+    var dispatch = function() {
+        window.dispatchEvent(new CustomEvent('webextFlavor'));
+    };
+
+    // Order of tests is important!
+
+    // Asynchronous
+    if (
+        self.browser instanceof Object &&
+        typeof self.browser.runtime.getBrowserInfo === 'function'
+    ) {
+        self.browser.runtime.getBrowserInfo().then(function(info) {
+            vAPI.webextFlavor =
+                info.vendor + '-' + info.name + '-' + info.version;
+            dispatch();
+        });
+        match = /Firefox\/([\d.]+)/.exec(ua);
+        return match !== null ? 'Mozilla-Firefox-' + match[1] : '';
+    }
+
+    // Synchronous
+    /* Don't starve potential listeners: */ vAPI.setTimeout(dispatch, 97);
+    match = /OPR\/([\d.]+)/.exec(ua);
+    if ( match !== null ) {
+        reEx = /Chrom(?:e|ium)\/([\d.]+)/;
+        if ( reEx.test(ua) ) { match = reEx.exec(ua); }
+        return 'Opera-Chromium-' + match[1];
+    }
+    match = /Chromium\/([\d.]+)/.exec(ua);
+    if ( match !== null ) {
+        return 'Chromium-Chromium-' + match[1];
+    }
+    match = /Chrome\/([\d.]+)/.exec(ua);
+    if ( match !== null ) {
+        return 'Google-Chromium-' + match[1];
+    }
+    return '';
+})();
+
+/******************************************************************************/
+
 // http://www.w3.org/International/questions/qa-scripts#directions
 
 var setScriptDirection = function(language) {
@@ -77,10 +121,7 @@ setScriptDirection(vAPI.i18n('@@ui_locale'));
 //   `window.open('', '_self').close()`. 
 
 vAPI.closePopup = function() {
-    if (
-        self.browser instanceof Object &&
-        typeof self.browser.runtime.getBrowserInfo === 'function'
-    ) {
+    if ( /^Mozilla-Firefox-/.test(vAPI.webextFlavor) ) {
         window.close();
         return;
     }

platform/webext/vapi-webrequest.js

@@ -43,20 +43,17 @@ vAPI.net.registerListeners = function() {
     // https://github.com/gorhill/uBlock/issues/2950
     // Firefox 55 does not normalize URLs to ASCII, uBO must do this itself.
     // https://bugzilla.mozilla.org/show_bug.cgi?id=945240
-    let mustPunycode = false;
-    (function() {
-        if ( 
-            typeof browser === 'object' &&
-            browser !== null &&
-            browser.runtime instanceof Object &&
-            typeof browser.runtime.getBrowserInfo === 'function'
-        ) {
-            browser.runtime.getBrowserInfo().then(info => {
-                mustPunycode = info.name === 'Firefox' &&
-                               /^5[0-6]\./.test(info.version);
-            });
-        }
-    })();
+    let evalMustPunycode = function() {
+        return /^Mozilla-Firefox-5[0-6]/.test(vAPI.webextFlavor);
+    };
+
+    let mustPunycode = evalMustPunycode();
+
+    // The real actual webextFlavor value may not be set in stone, so listen
+    // for possible future changes.
+    window.addEventListener('webextFlavor', function() {
+        mustPunycode = evalMustPunycode();
+    }, { once: true });
 
     let wrApi = browser.webRequest;
 

src/js/assets.js

@@ -912,8 +912,7 @@ var updateFirst = function() {
             typeof browser === 'object' &&
             browser.runtime.getManifest();
         noRemoteResources =
-            typeof vAPI.webextFlavor === 'string' &&
-            vAPI.webextFlavor.startsWith('Mozilla-Firefox-') &&
+            /^Mozilla-Firefox-/.test(vAPI.webextFlavor) &&
             manifest instanceof Object &&
             manifest.applications instanceof Object &&
             manifest.applications.gecko instanceof Object &&

src/js/static-net-filtering.js

@@ -1605,7 +1605,7 @@ FilterParser.prototype.translate = function() {
         this.dataStr = "connect-src https: http:";
         // https://bugs.chromium.org/p/chromium/issues/detail?id=669086
         // TODO: remove when most users are beyond Chromium v56
-        if ( vAPI.chromiumVersion < 57 ) {
+        if ( /-Chromium-(?:4|5[0-6])/.test(vAPI.webextFlavor) ) {
             this.dataStr += '; frame-src *';
         }
         return;

src/js/traffic.js

@@ -1126,20 +1126,17 @@ var injectCSP = function(pageStore, details) {
 
 // https://github.com/gorhill/uMatrix/issues/967#issuecomment-373002011
 //   This can be removed once Firefox 60 ESR is released.
-var cantMergeCSPHeaders = (function() {
-    if (
-        self.browser instanceof Object &&
-        typeof self.browser.runtime.getBrowserInfo === 'function'
-    ) {
-        self.browser.runtime.getBrowserInfo().then(function(info) {
-            cantMergeCSPHeaders =
-                info.vendor === 'Mozilla' &&
-                info.name === 'Firefox' &&
-                parseInt(info.version, 10) < 59;
-        });
-    }
-    return false;
-})();
+var evalCantMergeCSPHeaders = function() {
+    return /^Mozilla-Firefox-5[2-8]/.test(vAPI.webextFlavor);
+};
+
+var cantMergeCSPHeaders = evalCantMergeCSPHeaders();
+
+// The real actual webextFlavor value may not be set in stone, so listen
+// for possible future changes.
+window.addEventListener('webextFlavor', function() {
+    cantMergeCSPHeaders = evalCantMergeCSPHeaders();
+}, { once: true });
 
 /******************************************************************************/