User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:35.0) Gecko/20100101 Firefox/35.0 Build ID: 20141128004001 Steps to reproduce: 1. Create a new add-on using cfx init 2. Put the code (see below) in lib/main.js 3. Run the cfx command (see below). 4. Navigate to any page. System: Android/Firefox 34 SDK Git branch: firefox34 Command: cfx run -a fennec-on-device -b adb --mobile-app firefox --force-mobile Log: adb logcat | console lib/main.js code: var data = require('sdk/self').data; var pageMod = require('sdk/page-mod'); pageMod.PageMod({ include: '*', contentScriptWhen: 'ready', attachTo: 'top', contentScriptFile: data.url('mod.js'), contentStyleFile: data.url('mod.css') }); (my data/mod.js file is empty) Actual results: When running the addon and navigating to any page I get this error in adb logcat: E/GeckoConsole(23750): [JavaScript Error: "[Exception... "Component does not have requested interface" nsresult: "0x80004002 (NS_NOINTERFACE)" location: "JS frame :: resource://gre/modules/addons/XPIProvider.jsm -> jar:file:///storage/emulated/legacy/jetpack-profile/extensions/jid1-401NAesIVVcWXQ@jetpack.xpi!/bootstrap.js -> resource://gre/modules/commonjs/toolkit/loader.js -> resource://gre/modules/commonjs/sdk/tabs/utils.js :: isFennecTab :: line 42" data: no]"] And my page mod script is not executed as expected. Expected results: The page mod script should be loaded and exectued. This worked as expected when using Android/Firefox 33

For me, it seems like contentStyleFile: data.url('mod.css') is causing the exception.

I have the same issue (and also did not in Fennec 33). Removing the content style file "solved" it for me as well.

Looks like this line of code is the culprit: > tab.QueryInterface(Ci.nsIBrowserTab) === tab;

This bug seems to be causing the following issue: https://github.com/kevincox/youtube-e2l/issues/10

This bug is causing the following issue as well: https://github.com/pratikabu/scrolltotop/issues/35

Does still reproduce on Firefox 40? Because bug 1167764 which is similar doesn't anymore.