Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

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.

Firefox can´t install or update any extensions. Please Help!

Need help, please!
Need help, please!
more options

Any attempt to update existing or new extensions gives me this text in swedish: "kan inte installera filen på https://addons.mozilla.org/firefox/downloads/latest/3064/addon-3064-latest.xpi?src=search p.g.a.: Ogiltig filhash (möjligen en skadad filhämtning) -261" or similar to all my attempts. I can still install extensions through other webpages, but not within the extensions menu in firefox.

I use a Mac with 10.6.6. Please help me! Already tried to delete the .ini files....

Thx

Any attempt to update existing or new extensions gives me this text in swedish: "kan inte installera filen på https://addons.mozilla.org/firefox/downloads/latest/3064/addon-3064-latest.xpi?src=search p.g.a.: Ogiltig filhash (möjligen en skadad filhämtning) -261" or similar to all my attempts. I can still install extensions through other webpages, but not within the extensions menu in firefox. I use a Mac with 10.6.6. Please help me! Already tried to delete the .ini files.... Thx

All Replies (2)

the-edmeister
the-edmeister
  • Moderator
more options

If Firefox gave you the following error message: Firefox could not install the file at https://addons.mozilla.org/******.xpi because: Invalid file hash (possible download corruption) -261

This error message may be caused when Firefox is set dis-allow third party cookies. To accept the third party cookies: go to Tools -> Options -> Privacy -> tick 'Accept third party cookies'.

Need help, please!
Need help, please! Question owner
more options

I get that error message even though I already have ticked the "Accept third party cookies".

Please help me! I´ve tried to solve this so many times and now I need your help cause I can´t figure it out.

Thx!