Bug 578711 - Opening two copies of 'Tabs from my Other Computers' closes Fennec [r=vingtetun]

mobile/chrome/content/browser-ui.js

@@ -587,6 +587,17 @@ var BrowserUI = {
     return tab;
   },
 
+  newOrSelectTab: function newOrSelectTab(aURI, aOwner) {
+    let tabs = Browser.tabs;
+    for (let i = 0; i < tabs.length; i++) {
+      if (tabs[i].browser.currentURI.spec == aURI) {
+        Browser.selectedTab = tabs[i];
+        return;
+      }
+    }
+    this.newTab(aURI, aOwner);
+  },
+
   closeTab : function closeTab(aTab) {
     // If no tab is passed in, assume the current tab
     Browser.closeTab(aTab || Browser.selectedTab);

mobile/chrome/content/sync.js

@@ -48,7 +48,7 @@ let WeaveGlue = {
   },
 
   openRemoteTabs: function openRemoteTabs() {
-    this._openTab("about:sync-tabs");
+    BrowserUI.newOrSelectTab("about:sync-tabs", null);
   },
 
   connect: function connect() {
@@ -80,10 +80,6 @@ let WeaveGlue = {
     addEventListener("unload", function() addRem(false), false);
   },
 
-  _openTab: function _openTab(url) {
-    setTimeout(function() BrowserUI.newTab(url), 0);
-  },
-
   get _settings() {
     // Do a quick test to see if the options exist yet
     let syncButton = document.getElementById("sync-syncButton");