Facebook doesn't work in Firefox 15. Any idea why?

The Facebook login page comes up momentarily, and then is quickly succeeded by an error message:
File not found
Firefox can't find the file at jar:file:///C:/Program Files (x86)/Mozilla Firefox/omni.ja!/chrome/browser/content/browser/undefinedcheck6only.facebook.comajax/v6.php?v=check6only&pingonly=false.
Others are having similar problems. Pretty disastrous for Firefox's reputation, I fear.

Start Firefox in <u>[[Safe Mode|Safe Mode]]</u> to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance/Themes).
*Don't click the Reset button on the Safe mode start window or otherwise make changes.
*https://support.mozilla.org/kb/Safe+Mode
You can check for problems with the preferences and if necessary delete the prefs.js file and a possible user.js file to reset all prefs.
*http://kb.mozillazine.org/Resetting_preferences

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Cannot access BTyahoo mail using safari or google chrome but can using Firefox. Any ideas why and how it is fixed

I have recently signed up to BT but find that I cannot access BTyahoo mail using either safari or google chrome - the pages are just not available. But it works with Firefox. Any ideas why and how it can be fixed?

Hi, this has worked for a few...
Make a New Location, Using network locations in Mac OS X ...
http://support.apple.com/kb/HT2712
10.7 & 10.8…
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10.5.x/10.6.x/10.7.x instructions...
System Preferences>Network, click on the little gear at the bottom next to the + & - icons, (unlock lock first if locked), choose Set Service Order.
The interface that connects to the Internet should be dragged to the top of the list.
10.4 instructions...
Is that Interface dragged to the top of Network>Show:>Network Port Configurations.
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For 10.5/10.6/10.7/10.8, System Preferences>Network, unlock the lock if need be, highlight the Interface you use to connect to Internet, click on the advanced button, click on the DNS tab, click on the little plus icon, then add these numbers...
208.67.222.222
208.67.220.220
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Hello ! I got a so good answer last time... that I'm coming back to you guys ! I'm trying to send a text message to more than hundred people... It doesn't work... Any ideas ?

Hello ! I got a so good answer last time... that I'm coming back to you guys ! I'm trying to send a text message to more than hundred people... It doesn't work... Any ideas ?
Thanks a lot in advance for your answers !!!
Have a nice evening/day !

That is a legitimate Mozilla newsletter. As it says in the email:
You're receiving this email because you subscribed to receive email newsletters and information from Mozilla. If you do not wish to receive these newsletters, please click the Unsubscribe link below.
Unsubscribe https://www.mozilla.org/en-US/newsletter/existing/ad9febcf-65ac-41fd-810b-798945f448f3/
Modify your preferences https://www.mozilla.org/en-US/newsletter/existing/ad9febcf-65ac-41fd-810b-798945f448f3/ "

Facebook doesn't work with Firefox 28.0 + Flashplayer 12,0,0,77

Hey everybody,
first of all let me tell you the specs of my system:
Laptop:
Windows 7 Home Premium 64 bit
Acer Aspire 7745G Laptop
Intel i7 Q720 @1,6 GHz
4,00 GB RAM
Browser:
Mozilla Firefox 28.0
Flash Player Version:
12,0,0,77
Problem:
So the Flash Player and Firefox just updated like 1-2 days ago and after that Facebook didn't work anymore. As you might know Facebook just refreshed its design so I think that they're now using some kind of Flash for their layout.
Well no matter what Facebook is using, I only get a white screen with no Layout, here's a screenshot (By the way, I just get this error with the new Firefox, Chrome works with no problems):
In addition to that all other video streaming pages like youtube couldn't load its videos. Firefox always displayed this message:
I was waiting for about 10 minutes, after clicking on "Continue", then I closed Firefox by force with the Taskmanager.
This message always appeared when I was trying to watch a Flashvideo on Firefox, no matter which page (Youtube, etc.).
When I clicked "Stop Plugin" of course the Flash Player crashed. And it showed me this message instead of the video:
Reloading the page or clearing the Firefox cache didn't solve the problem. I also cleared the Flash Player cache in the Flashplayer and the Macromedia folder as it is described here:
http://helpx.adobe.com/en/flash-player/kb/flash-player-games-video-or.html#main_6__Remove_ Flash_Player_cache
So after that I deinstalled Firefox and the Flashplayer, reinstalled them and restarted my laptop.
Now the videos work fine, but Facebook still isn't displayed correctly, I can still only see the white screen which I showed you above.
This is how my plugins page looks like:
So brief summary:
Problem:
New Facebook + Flash videos doesn't/didn't work
What I already tried:
1. Reload the pages
2. Clearing Firefox Cache
3. Clearing Flashplayer Cache in the Flashplayer and Macromedia folder
4. Updating/Reinstalling Firefox several times
5. Updating/Reinstalling Flashplayer several times
6. After that rebooting Laptop
7. Testing Facebook on Chrome and it works in that browser, so either Firefox or Flashplayer is corrupt/faulty
Status Quo:
Facebook still not working
Videos now working on every page (after reinstalling and rebooting the laptop)
Please don't give me the advice to just change browsers, I have Chrome and it works, but I still like Firefox more and I would be very grateful, if somebody could help me solving this problem.
I tried to be detailed as possible, but if you still need further information feel free to ask me.
Best Regards,
Kahzel

Ok, I solved it now. The problem was the Adblock plus Add-on which blocked all facebook contents.
I just tweaked the filter to allow all akamai.net content, then it worked.
So to sum it up Adblock Plus was the reason why noting worked, I don't know why the videos crashed though, but this issue seems to be fixed, too so I don't have any other complains.
So what did I do to come to this conclusion?
Disabled all Add-Ons
See if the problem still occurs
Activate Add-Ons one by one to see which one causes the problem
Look up why the Add-On is causing the problem and how to fix this
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My google doesn't work on firefox or any program else, can you help?

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Do you have multiple keyboard layouts installed?
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Facebook doesn't work in Firefox 15. Any idea why?

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