The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information. Note: This will cause you to lose any Extensions, Open websites, and some Preferences.

To Reset Firefox do the following:

1. Go to Firefox > Help > Troubleshooting Information.
2. Click the "Reset Firefox" button.
3. Firefox will close and reset. After Firefox is done, it will show a window with the information that is imported. Click Finish.
4. Firefox will open with all factory defaults applied.

Further information can be found in the Refresh Firefox - reset add-ons and settings article.

Did this fix your problems? Please report back to us!

Ugh. i figured running without addons would do the same thing. But, i reset, and it seems to have stopped. So thanks!

Tried again this evening, and its back again! So solution canceled.

Can you attach a screenshot?

• http://en.wikipedia.org/wiki/Screenshot
• https://support.mozilla.org/kb/how-do-i-create-screenshot-my-problem

Use a compressed image type like PNG or JPG to save the screenshot.

Did you install any extensions or have changed prefs directly (about:config) in the new profile that was created via the reset?

Maybe a new profile without importing data like a reset does works better.

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

See "Creating a profile":

• https://support.mozilla.org/kb/profile-manager-create-and-remove-firefox-profiles
• http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Profile_issues

If the new profile works then you can transfer some files from an existing profile to the new profile, but be careful not to copy corrupted files.

• http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

There may be extensions and plugins installed by default in a new profile, so check that in "Tools > Add-ons > Extensions & Plugins" in case there are still problems.

Images attached of the issue occuring, and the same view after restarting the browser. The problematic one appears flat.

I have installed extensions since the reset.

       Download Statusbar
       0.9.10
       true
       {D4DD63FA-01E4-46a7-B6B1-EDAB7D6AD389}

       Feedback
       1.2.2
       true
       testpilot@labs.mozilla.com

       Gmail Watcher
       1.57
       true
       gmailwatcher@sonthakit

       NoScript
       2.6.4.1
       true
       {73a6fe31-595d-460b-a920-fcc0f8843232}

       Personas
       1.6.2
       true
       personas@christopher.beard

       Adobe Acrobat - Create PDF
       1.2
       false
       web2pdfextension@web2pdf.adobedotcom

       Skype Click to Call
       6.0.0.10297
       false
       {82AF8DCA-6DE9-405D-BD5E-43525BDAD38A}

However, this issue persists when running with no extensions. I will try creating a new profile as a test, with no information imported.

Created a new profile, happened about 3 minutes later with nothing done but a little browsing around. No extensions.

Try to disable hardware acceleration in Firefox.

• Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available"
• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

• https://hacks.mozilla.org/2010/09/hardware-acceleration/

In Firefox Safe mode these changes are effective:

• all extensions are disabled
• the default theme is used (no persona)
• userChrome.css and userContent.css are ignored
• the default toolbar layout is used
• the Javascript JIT compiler is disabled
• hardware acceleration is disabled

Disabling hardware acceleration makes it worse. With it off, when the problem starts happening, Firefox menus will only show their dropped shadow.