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

This thread was archived. Please ask a new question if you need help.

xpinstall.enabled seems to be missing

  • 1 reply
  • 30 have this problem
  • 7 views
  • Last reply by cor-el

markb63
markb63
more options

I've tried to install an ad on, I get the message that it's downloaded ok & I need to restart FF I've done this but nothing has happened started about:config typed xpinstall.enabled as instructed.

xpinstall.enabled is not there ? what next?

I've tried to install an ad on, I get the message that it's downloaded ok & I need to restart FF I've done this but nothing has happened started about:config typed xpinstall.enabled as instructed. xpinstall.enabled is not there ? what next?

All Replies (1)

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

The pref xpinstall.enabled is only present if it doesn't have the default value true and if that setting is disabled then you would get as far as you were already getting by downloading the file.

Delete the files extensions.* (extensions.sqlite, extensions.ini, extensions.cache, extensions.rdf) 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 do a compatibility check or see if there is an update.