Javascript Error Message

[Olly]

I know there's some IT/coders etc. people here so hoping you can help me with a series (4) of error messages I've started getting. I haven't done anything new to my PC or downloaded anything so don't know how it started, unless it's something to do with a recent upgrade with Firefox (something not compatible maybe?). Clicking OK on each message just brings up the next one. It happens every time a page loads - WHICH IS HEAPS! It's driving me insane!

Anyway, messages I get are in a box headed JavaScript Application,

1. "evalInSandbox Errorermission denied for http://facebook.com to create wrapper for object of class Unnamed Class"
2. "Errorermission denied for http://facebook.com to create wrapper for object of class Unnamed Class"
3. "evalInSandbox Errorermission denied for http://facebook.com to create wrapper for object of class Unnamed Class"
4. "Errorermission denied for http://facebook.com to create wrapper for object of class Unnamed Class"

I've ran every type of clean up tool there is plus 'fixed' registry issues - no change.

Any advice please.

Edit: Just realised the URL part of the message is a hyperlink in my post.
It's not a hyperlink in the error messages I get - in case that makes a difference.

 

[Crabnet]

Check that your firefox plugins and extensions are up to date.
http://www.mozilla.org/en-US/plugincheck/

Check for updates to any facebook specific plugins or extensions or firefox integrated programs relating to facebook because the firefox update may have broken them.

 

[D.T.]

First, rule out whether its an addon thats doing it.

To do this, run firefox in safe mode https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode and if the error no longer occurs then proceed to step 2.

Second, assuming its an addon, make sure they're all up to date.

Use http://www.mozilla.org/en-US/plugincheck/ to determine this.

Third, I've seen this is generally caused by an addon called Social Fixer (but yours might be different based on first 2 steps). If you use this addon, either update it or remove it. You can remove it by going into your Firefox Menu then finding the Extensions section where it'll have them all listed.

 

[Olly]

Thanks guys.
Updated all plug ins - still messages.
Updated Social Fixer and all's good!!!!
Yay!