We're calling on all EU-based Mozillians with iOS or iPadOS devices to help us monitor Apple’s new browser choice screens. Join the effort to hold Big Tech to account!

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.

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

Every time I start Firefox 8.0.1 it repeats the add-on compatibility check

  • 4 replies
  • 16 have this problem
  • 2 views
  • Last reply by Zico10

more options

Hi there I'm using Vista and since updating to Firefox 8.0.1 every single time I start Firefox it repeats the add-on compatibility check. I tried starting with add-ons disabled, deleting update files, started with different profile, nothing. Is this a bug and we have to wait for another update or if it can be sorted I would appreciate some help please. Cheers

Hi there I'm using Vista and since updating to Firefox 8.0.1 every single time I start Firefox it repeats the add-on compatibility check. I tried starting with add-ons disabled, deleting update files, started with different profile, nothing. Is this a bug and we have to wait for another update or if it can be sorted I would appreciate some help please. Cheers

Chosen solution

Firefox just updated to 9.0 Same problem. Is there a solution? Tried the two listed and they were less than helpful.

Read this answer in context 👍 0

All Replies (4)

more options

Anyone that can help please?

more options
more options

Chosen Solution

Firefox just updated to 9.0 Same problem. Is there a solution? Tried the two listed and they were less than helpful.

more options

Go to Firefox/Help/Troubleshooting, and in your Profile Directory/Open Profile Folder. Close Firefox (File,Exit) and on your Profile Folder look and delete this file "Pref.js" and any other "pref" files in there. Start Firefox and your preferences are reset to default. Go to Options and customise your preferences as you had before.