Did you delete the prefs.js file to reset all the prefs?

It is possible that there is a problem with the file(s) that store the extensions registry.

Delete the extensions.* files (e.g. extensions.json, extensions.sqlite, extensions.ini) and compatibility.ini in the Firefox profile folder to reset the extensions registry.

• https://support.mozilla.org/kb/Profiles

New files will be created when required.

See "Corrupt extension files":

• http://kb.mozillazine.org/Unable_to_install_themes_or_extensions
• https://support.mozilla.org/kb/Unable+to+install+add-ons

If you see disabled or not compatible extensions in "Firefox/Tools > Add-ons > Extensions" then click the Tools button at the left end of the Search bar to check if there is a compatibility update available.

Thanks, but unfortunately that didn't do it.

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
• Make sure that you do not exceed the maximum size of 1 MB

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

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 files from a previously used profile to the new profile, but be cautious not to copy corrupted files to avoid carrying over problems.

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

Attaching a screen shot. This is the theme "pink radiance" which certainly used to be pink, and with multirow bookmark addon set to 3 rows. Could this have anything to do with sync? i just created an account to link two computers, and now they both have this same problem. i havent tried creating a new profile yet, I'll try that next. Thanks!

I'm not finding this theme via a search on the Add-ons website.

Are you sure that this theme is still available?

Only the image files of the currently selected Persona are stored in the Firefox profile folder. All other Personas are loaded from the server if you choose another Persona. So if the image files are no longer on the server then you only get the default text and background as specified and stored in the lightweightThemes.usedThemes pref as you can find on the about:config page.

I created a new profile and transferred my bookmarks, history, etc. The new one works perfectly, and all my addons are functioning again. (btw, it was ALL themes that quit displaying, and Pink Radiance is still available, I have it on the new profile). Thank you SOOOOO much for your help. This was an extremely frustrating problem and your help was invaluable!!! Thank you!! Manda