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My extensions disappeared

Posted

Yesterday I had 7 extensions installed in Firefox 15.01. Today they are gone, although I see the in the profile folder. The extensions folder is empty. I'm really steamed, because some of these I rely on heavily. What happened?

Additional System Details

Installed Plug-ins

  • Shockwave Flash 11.4 r402
  • NPRuntime Script Plug-in Library for Java(TM) Deploy
  • Amazon MP3 Downloader Plugin 1.0.17
  • Next Generation Java Plug-in 10.9.2 for Mozilla browsers
  • NPWLPG
  • Adobe Shockwave for Director Netscape plug-in, version 11.6.7.637
  • Foxit Reader Plug-In For Firefox and Netscape
  • 5.1.10411.0

Application

  • User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:15.0) Gecko/20100101 Firefox/15.0.1

More Information

cor-el
  • Top 10 Contributor
  • Moderator
10779 solutions 97008 answers

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

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

New files will be created when required.

See "Corrupt extension files":

If you see disabled, not compatible, extensions in "Tools > Add-ons > Extensions" then click the Tools button at the left side of the Search Bar (or click the "Find Updates" button in older Firefox versions) to check if there is a compatibility update available.

If this hasn't helped then also try to delete the addons.sqlite file.

Question owner

I think it has something to do with Sync. I have 3 computers at various locations, and I probably did a sync from the wrong one oe in the wrong direction.  :-(