Removal of legacy CSS for builds after 2015-08-06. Fixes #714

Author: jonathanKingston

index.js

@@ -592,14 +592,22 @@ ContainerWindow.prototype = {
   _init(window) {
     this._window = window;
     this._tabsElement = this._window.document.getElementById("tabbrowser-tabs");
+    const NATIVE_CSS_BUILD_DATE = 20170806;
+    const NATIVE_CSS_VERSION = 57;
+
+    const buildID = Services.appinfo.appBuildID;
+    const version = Services.appinfo.version.match(/^[0-9]+\./)[1];
     this._style = Style({ uri: self.data.url("usercontext.css") });
     this._plusButton = this._window.document.getAnonymousElementByAttribute(this._tabsElement, "anonid", "tabs-newtab-button");
     this._overflowPlusButton = this._window.document.getElementById("new-tab-button");
 
     // Only hack the normal plus button as the alltabs is done elsewhere
     this.attachMenuEvent("plus-button", this._plusButton);
 
-    attachTo(this._style, this._window);
+    if (Number(buildID.substring(0, 8)) < NATIVE_CSS_BUILD_DATE
+        || version < NATIVE_CSS_VERSION) {
+      attachTo(this._style, this._window);
+    }
   },
 
   attachMenuEvent(source, button) {

package.json

@@ -2,7 +2,7 @@
   "name": "testpilot-containers",
   "title": "Containers Experiment",
   "description": "Containers works by isolating cookie jars using separate origin-attributes defined visually by colored ‘Container Tabs’. This add-on is a modified version of the containers feature for Firefox Test Pilot.",
-  "version": "3.0.0",
+  "version": "3.0.1",
   "author": "Andrea Marchesini, Luke Crouch and Jonathan Kingston",
   "bugs": {
     "url": "https://github.com/mozilla/testpilot-containers/issues"

webextension/manifest.json

@@ -1,7 +1,7 @@
 {
   "manifest_version": 2,
   "name": "Containers Experiment",
-  "version": "3.0.0",
+  "version": "3.0.1",
 
   "description": "Containers works by isolating cookie jars using separate origin-attributes defined visually by colored ‘Container Tabs’. This add-on is a modified version of the containers feature for Firefox Test Pilot.",
   "icons": {