Tap here to go to the mobile version of the site.
Your Firefox is out of date and may contain a security risk! Upgrade Firefox

Support Forum

Why am I getting JavaScript errors?


I get this JS error when changing pages (any page almost) and it doesnt matter if FB is open or not: evalInSandbox:Error: Permission denied for <https://facebook.com> to create wrapper for object of class UnnamedClass

It is followed by a further JS error: Error: Permission denied for <https://facebook.com> to create wrapper for object of class UnnamedClass

What is going on?

Chosen solution

Hi idowning

That is quite possible.

Did you try to disable this extension?

Read this answer in context 8

Additional System Details

Installed Plug-ins

  • Octoshape embedded video plugin
  • Shockwave Flash 11.7 r700
  • Adobe PDF Plug-In For Firefox and Netscape 11.0.03
  • Google Update
  • VLC media player Web Plugin 2.0.6
  • iTunes Detector Plug-in
  • Next Generation Java Plug-in 10.21.2 for Mozilla browsers
  • GEPlugin
  • 5.1.20125.0
  • RockMelt Update
  • The QuickTime Plugin allows you to view a wide variety of multimedia content in Web pages. For more information, visit the QuickTime Web site.
  • BlackBerry WebSL Browser Plug-In
  • Citrix Online App Detector Plugin
  • AppWorld NPAPI plugin
  • Office Live Update v1.5
  • Windows Presentation Foundation (WPF) plug-in for Mozilla browsers
  • DRM Netscape Network Object
  • Npdsplay dll
  • DRM Store Netscape Plugin
  • Yahoo! activeX Plug-in Bridge


  • Firefox 24.0a1
  • User Agent: Mozilla/5.0 (Windows NT 5.1; rv:24.0) Gecko/20130521 Firefox/24.0
  • Support URL: http://support.mozilla.org/1/firefox/24.0a1/WINNT/en-US/


  • Adblock Edge 2.0.4 ({fe272bd1-5f76-4ea4-8501-a05d35d823fc})
  • Awesome screenshot: Capture and Annotate 2.4.0 (jid0-GXjLLfbCoAx0LcltEdFrEkQdQPI@jetpack)
  • Default Theme Engine - Personas Interactive (btpersonas@brandthunder.com)
  • Download Statusbar 0.9.10 ({D4DD63FA-01E4-46a7-B6B1-EDAB7D6AD389})
  • DownloadHelper 4.9.14 ({b9db16a4-6edc-47ec-a1f4-b86292ed211d})
  • Fastest Facebook 1.1 ({288479BE-1B9E-11E2-80EA-F3246188709B})
  • FDislike (fbdislike@doweb.fr)
  • Flagfox 4.2.9 ({1018e4d6-728f-4b20-ad56-37578a4de76b})
  • Flash Video Downloader - Youtube Downloader 3.8.7 (artur.dubovoy@gmail.com)
  • Google Translator for Firefox (translator@zoli.bod)
  • Hola Unblocker 1.1.67 (jid1-4P0kohSJxU1qGg@jetpack)
  • ImTranslator 5.5 ({9AA46F4F-4DC7-4c06-97AF-5035170634FE})
  • Integrated Gmail 2.8.9 ({28197867-b1ef-4140-8e3b-55c45b9c8460})
  • Microsoft .NET Framework Assistant 0.0.0 ({20a82645-c095-46ed-80e3-08825760534b})
  • Noia Fox options 2.1.0 (NoiaFoxoption@davidvincent.tld)
  • Quick Maps 1.9.0 (map@quickmaps.me)
  • Silvermel and Charamel XT 1.5.5 (silvermelxt@pardal.de)
  • Social Fixer 7.501 (socialfixer@mattkruse.com)
  • Test Pilot 1.2.2 (testpilot@labs.mozilla.com)
  • Troubleshooter 1.1a (troubleshooter@mozilla.org)
  • Webmail Ad Blocker 3.9.1 (gmailnoads@mywebber.com)
  • WiseStamp 3.13.4 (wisestamp@wisestamp.com)
  • Youtube Video Center 2.4 ({34878998-c8be-40bc-bc13-9243a2844976})
  • Gmail Manager ({582195F5-92E7-40a0-A127-DB71295901D7}) (Inactive)
  • Java Quick Starter 1.0 (jqs@sun.com) (Inactive)
  • LastPass 2.0.20 (support@lastpass.com) (Inactive)
  • Social Fixer 6.603 (betterfacebook@mattkruse.com) (Inactive)


  • incrementalGCEnabled: True


  • adapterDescription: Intel(R) 82945G Express Chipset Family
  • adapterDescription2:
  • adapterDeviceID: 0x2772
  • adapterDeviceID2:
  • adapterDrivers: igxprd32
  • adapterDrivers2:
  • adapterRAM: Unknown
  • adapterRAM2:
  • adapterVendorID: 0x8086
  • adapterVendorID2:
  • direct2DEnabled: False
  • direct2DEnabledMessage: [u'blockedDriver']
  • directWriteEnabled: False
  • directWriteVersion:
  • driverDate: 2-15-2008
  • driverDate2:
  • driverVersion:
  • driverVersion2:
  • info: {u'AzureCanvasBackend': u'skia', u'AzureFallbackCanvasBackend': u'cairo', u'AzureContentBackend': u'none'}
  • isGPU2Active: False
  • numAcceleratedWindows: 0
  • numAcceleratedWindowsMessage: [u'']
  • numTotalWindows: 1
  • webglRenderer: Google Inc. -- ANGLE (Intel(R) 82945G Express Chipset Family Direct3D9 vs_0_0 ps_2_0)
  • windowLayerManagerType: Basic

Modified Preferences

  • browser.cache.disk.capacity: 358400
  • browser.cache.disk.smart_size.first_run: False
  • browser.cache.disk.smart_size.use_old_max: False
  • browser.cache.disk.smart_size_cached_value: 358400
  • browser.places.smartBookmarksVersion: 4
  • browser.startup.homepage_override.buildID: 20130521114340
  • browser.startup.homepage_override.mstone: 24.0a1
  • dom.mozApps.used: True
  • dom.w3c_touch_events.expose: False
  • extensions.lastAppVersion: 24.0a1
  • font.internaluseonly.changed: False
  • font.name.serif.x-western: Tahoma
  • network.cookie.prefsMigrated: True
  • places.database.lastMaintenance: 1369198854
  • places.history.expiration.transient_current_max_pages: 26617
  • plugin.disable_full_page_plugin_for_types: application/pdf
  • plugin.importedState: True
  • privacy.sanitize.migrateFx3Prefs: True
  • security.warn_viewing_mixed: False
  • storage.vacuum.last.index: 1
  • storage.vacuum.last.places.sqlite: 1368114211


  • User JS: No
  • Accessibility: No
  • Top 10 Contributor
  • Moderator
10759 solutions 96838 answers

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).

  • Do NOT click the Reset button on the Safe Mode start window or otherwise make changes.
idowning 0 solutions 2 answers

I'm running Social Fixer to block suggested posts on fb. I wondered if this was a possible cause.

  • Top 10 Contributor
  • Moderator
10759 solutions 96838 answers

Chosen Solution

Hi idowning

That is quite possible.

Did you try to disable this extension?

idowning 0 solutions 2 answers

Yeah, the problem stopped under "restart with extensions disabled" so I went to help/troubleshooting information/reset and it reloaded with all my favourites, history etc intact. Thanks a lot

levinjb 0 solutions 4 answers

I started getting these two errors immediately with the 22.0 upgrade. I am also running NoScript (auto-upgraded simultaneously with Firefox) and SocialFixer; but the latter should only run if I'm on a Facebook page. These errors happen on lots of pages. They stopped when I blocked "Facebook Connect" and "Facebook Social Plugins" in Ghostery.

levinjb 0 solutions 4 answers

Helpful Reply

The problem went away when I upgraded SocialFixer (and Ghostery, which was another automatic upgrade). Between auto-upgrades of add-ons and FireFox itself, it's hard sometimes to maintain control of what changes are related to what possible new problxxxx features. :-)

Case closed (for me)

arizonawolfman 0 solutions 1 answers

Helpful Reply

The solution to fix this bug caused by Mozilla Firefox 22.0 update, you simply upgrade Social Fixer here: http://socialfixer.com/blog/category/releasenotes/

levinjb 0 solutions 4 answers

As I suggested above, I had already made this discovery. Thanks

SubGuy 0 solutions 1 answers

Well, that didn't work for me, because when I try to go to the Social Fixer website in Firefox I get an error message.

Peggy 0 solutions 2 answers

This is getting extremely irritating! I've disabled ALL of my extensions, and still getting these -

evalInSandbox:Error: Permission denied for <https://facebook.com> to create wrapper for object of class UnnamedClass


Error: Permission denied for <https://facebook.com> to create wrapper for object of class UnnamedClass

Peggy 0 solutions 2 answers

Where do you find restart with extensions disabled??

  • Top 10 Contributor
  • Moderator
10759 solutions 96838 answers

Hi pgurney

You can find that in the Help menu in the menu bar or under the orange Firefox menu button.

ohmster 0 solutions 3 answers

Yes, updating social fixer did it for me too. Actually, this is a new computer (OMG, fast as HELL, 16Gb DDR3 and a real SSD hard drive!) and I did not have Social Fixer installed. Once installed, the error went away. Thanks everybody! Here is the link for those that want it. This is good stuff, people!

Download Social Fixer

Modified by ohmster

md140963 0 solutions 3 answers

I'm getting the same error messages as others here, and I've disabled the extensions. I'm loathe to use SocialFixer as the only time I used it, not long after installation I found that it blocked things I didn't want it to so no longer use it. Perhaps I didn't investigate all its options thoroughly, but for now, I just want the error messages to stop! Anyone any other ideas please?

  • Top 10 Contributor
  • Moderator
10759 solutions 96838 answers

Is this happening with the current Firefox 23.0.1 release or with a beta release or Nightly/Aurora build (the OP that started this thread was using an Nightly (a1) build)?

Create a new profile as a test to check if your current profile is causing the problems.

See "Creating a profile":

If the new profile works then you can transfer some files from an existing profile to the new profile, but be cautious not to copy corrupted files to avoid carrying over the problem.

levinjb 0 solutions 4 answers

I had the problem when I upgraded to 22.0, and it went away when a couple addons were updated, Socialfixer among them. I'm at 23.0.1 or 23.1 (or whatever the latest release channel version is) and the problem has not recurred. I consider this to be closed (as far as I am concerned).

md140963 0 solutions 3 answers

Hi Cor-el

I should have mentioned; I'm running 23.0.1

Creating the new profile worked. Facebook didn't throw any errors up. I was about to ask the $64,000 question "How do I know which files aren't corrupted" when I read the "Transferring your data..." page. That's something I'll do in the future as it looks like I'll need to concentrate and lie down in a dark, quiet room to do it. That's a luxury I don't have at the moment :) But many thanks for your help so far.

ohmster 0 solutions 3 answers

md140963, creating an entire new profile can be quite a long, arduous project if you are a heavy Firefox user and have installed and setup all of the add ons and plugins that you need and want. That is like killing a fly with a sledgehammer. It will work, but might mess up the walls quite a bit. :)

I am a PC user for decades but am not a programmer. IMHO, the problem is with the updated Facebook code and the most recent Firefox version to interpret it. I think if left alone long enough, one or the other would update to make the issue go away. Social Fixer is actually a pretty neat and free tool. It can change or alter many things on FB or, be so tamed down it essentially does nothing. Up to you. You spend a bit of time in the options, get it the way you like, and in the User Preferences you can export your settings, save them, import them, clear them, or reset them. So you never have to go all through it over again if an update wipes your changes out.

That, to me, is a LOT easier and quicker than creating an entirely new profile that is essentially a carbon copy of my original profile. I have 31 extensions for Firefox installed and setup. Maybe I can trim some of it, but I actually use almost all of them daily. Some occasionally but when I need them, they are there. I took an online 4 hour driver school test for a traffic ticket and quickly found out that it would take over 12 hours to complete this test! That is NOT FAIR, I only had to do 4 hours and when I called to complain about it, I was told that all the questions in the test were necessary to meet the requirements of DMV and I had not choice. So, I installed Fireshot and cheated my way straight through the test, passed it, and was done in a jiffy. Fireshot lets you capture web pages complete, even ones that scroll all the way down. So I just copied every page, and when I got to the test, I searched my Fireshot folder for keywords, found the answers, and just put them into the test. Cheating? Yes, but paying 12 hours for a 4 hour test is not exactly a fair trade. So, I did what I had to do.

If you like to tinker and spend hours on it, sometimes I do that, then go for the new profile. But if you just want to get past it and move on with your browsing, install Social Fixer and turn everything off. My 2¢.

Good luck!

md140963 0 solutions 3 answers

Must admit, ohmster, that I am fairly IT-literate, but the thought of doing all the moves one at a time to a new profile is not something I want to consider in all honesty. I'll give Social Fixer another go and if all else fails, I'll wait until Mozilla / Zuckerberg sort it out between themselves :)