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.

An add-on disappeared

liffeywater
liffeywater
more options

I'm using 17.0.1. AdBlock Plus has disappeared on me, and I can't find it. I tried reinstalling it, but that didn't work. I went to the extensions list, but all I get is a blank page. I already tried going into my profile folder and removing the extensions files so that they would be rebuilt upon restart, but that didn't fix my problem. I haven't installed anything new recently.

I'm using 17.0.1. AdBlock Plus has disappeared on me, and I can't find it. I tried reinstalling it, but that didn't work. I went to the extensions list, but all I get is a blank page. I already tried going into my profile folder and removing the extensions files so that they would be rebuilt upon restart, but that didn't fix my problem. I haven't installed anything new recently.

Chosen solution

Make sure that you select the Extensions tab if you open the about:addons page (Tools > Add-ons > Extensions)?

Did you also delete compatibility.ini ?

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.

Read this answer in context 👍 1

All Replies (5)

iamjayakumars
iamjayakumars
more options

Make sure that your not running Firefox in safemode.

To Quit Safemode

  • Firefox Menu - File > Exit.
liffeywater
liffeywater Question owner
more options

I'm definitely not in safe mode.

iamjayakumars
iamjayakumars
more options

So your localstore.rdf file may be corrupted

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

Chosen Solution

Make sure that you select the Extensions tab if you open the about:addons page (Tools > Add-ons > Extensions)?

Did you also delete compatibility.ini ?

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.

Modified by cor-el

liffeywater
liffeywater Question owner
more options

I'd missed removing compatibility.ini before. Thank you very much.