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.

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.

Sync 1.6 update won't install

  • 3 replies
  • 6 have this problem
  • 1 view
  • Last reply by moreglia

moreglia
moreglia
more options

I have Sync 1.5.1 running on Windows 7/64bit machine, running Firefox 3.6.3 When I try to update Sync, I get:

"Firefox could not install the file at

http://releases.mozilla.org/pub/mozilla.org/addons/10868/firefox_sync-1.6.1-fx+fn+sm.xpi

because: Invalid file hash (possible download corruption) -261"

I have Sync 1.5.1 running on Windows 7/64bit machine, running Firefox 3.6.3 When I try to update Sync, I get: "Firefox could not install the file at http://releases.mozilla.org/pub/mozilla.org/addons/10868/firefox_sync-1.6.1-fx+fn+sm.xpi because: Invalid file hash (possible download corruption) -261"

All Replies (3)

TonyE
TonyE
  • Moderator
more options

Make sure that 3rd party cookies are accepted, for details see https://support.mozilla.com/en-US/kb/Unable%20to%20install%20add-ons#w_invalid-file-hash-possible-download-corruption-261

UncleBen
UncleBen
more options

I have third party cookies enabled, and I still get this message.

moreglia
moreglia Question owner
more options

I did have 3rd party cookies enabled. Today the update succeeded without error (after about the 10th try).