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Strange bug just popped up for me today. No CSS is being applied to any web pages in firefox.

Version is 15.0.1

I have tried starting in safe mode, but problem persists

I have verified the View > Page Style is still set to basic.

What could be happening here?

Thanks for any help

Here's and example of what google like:

Google without CSS

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Do you have any extensions that may affect stylesheets on all websites? –  Jay Sep 8 '12 at 2:54
    
@Jay, As I said, I tried starting it in safe mode, which disables all extensions, and the problem persisted. I also tried clearing everything from cache/cookies, as well as restarting my machine. All to no avail. –  Jonah Sep 8 '12 at 2:56
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2 Answers 2

If you are not afraid of losing any extensions/plugins/settings/preferences, then delete your current profile and make a new one. This will reset everything.

  1. Right-click on your Firefox shortcut and go to Properties.
  2. At the end of the target field, type in a space followed by -P, press OK.
  3. Start Firefox and the profile manager should come up. Delete your current profile and make a new one.
  4. Exit from the profile manager and then change the Firefox shortcut back to how it was.
  5. Open Firefox and everything will be reset back to default.
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First check this Mozilla Firefox Troubleshooting help page

Troubleshoot and diagnose Firefox problems:

Then check if the problem is limited only to one Firefox profile or all of them by creating a new Firefox profile:

Add this command line (or the equivalent in your system) in a shortcut:

"C:\Program Files (x86)\Mozilla Firefox\firefox.exe" -profilemanager

Finally try in an other Windows user account to check if the problem is limitated to your current account or for the entire system...

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