This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Natao arisiva ity resaka mitohy ity. Mametraha fanontaniana azafady raha mila fanampiana.

Why after refreshing Firefox and updating to 41.0.2 are add-ons all "not compatible with my version?

  • 3 valiny
  • 2 manana an'ity olana ity
  • 9 views
  • Valiny farany nomen'i ghmills

ghmills
ghmills
more options

I refreshed FF to improve performance and updated to new version but when I go to get any add-on, the list description says "This add-on is not compatible with your version of Firefox because of the following:" (It gives no actual reason for the incompatibility only describes the characteristics of the add-on listed). Then if I try to download one anyway the download simply fails. Using old windows xp home. The add-ons worked fine before I refreshed and I haven't really noticed much improvement in performance. I'm curious about what happened and what my options are now.

I refreshed FF to improve performance and updated to new version but when I go to get any add-on, the list description says "This add-on is not compatible with your version of Firefox because of the following:" (It gives no actual reason for the incompatibility only describes the characteristics of the add-on listed). Then if I try to download one anyway the download simply fails. Using old windows xp home. The add-ons worked fine before I refreshed and I haven't really noticed much improvement in performance. I'm curious about what happened and what my options are now.

All Replies (3)

cor-el
cor-el
  • Moderator
  • Top 10 Contributor
more options

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.

New files will be created when required.

See "Corrupt extension files":

If you see disabled or not compatible extensions in "Firefox menu button/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.

If this hasn't helped then also delete the addons.json file.

You can use this button to go to the current Firefox profile folder:

ghmills
ghmills Tompon'ny fanontaniana
more options

The files you refer to are in the Old FF Data folder generated when I refreshed, but although I can find an "extensions" folder. Search results show no extensions files any where in the Moz FF directory. Do I need to uninstall FF reinstall the whole thing?

ghmills
ghmills Tompon'ny fanontaniana
more options

Please excuse me I'm not very good at this. However I did follow your instruction and have located those files. Will try your suggestion to delete them.....This does not seem to have fixed anything. But also now I notice in the extensions section of the Add-ons manager that Avast security, MS.net framework assistant, default mngr, and search helper extension are all disabled.

Novain'i ghmills t@