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

Firefox won't update. It downloads and says 'unable to verify the integrity of the incremental update', so it downloads the complete update package

  • 1 reply
  • 92 have this problem
  • 13 views
  • Last reply by cor-el

more options

Firefox won't update. It downloads and says 'unable to verify the integrity of the incremental update', so it downloads the whole version. But this doesn't work. Even if I download using Safari it won't install.

Firefox won't update. It downloads and says 'unable to verify the integrity of the incremental update', so it downloads the whole version. But this doesn't work. Even if I download using Safari it won't install.

All Replies (1)

more options

See http://kb.mozillazine.org/Installing_Firefox#Mac_OS_X ..... Download a new copy of the Firefox program: http://www.mozilla.com/firefox/all.html Trash the current Firefox application to do a clean reinstall. Install the new version that you have downloaded. Your profile data is stored elsewhere in the Firefox Profile Folder, so you won't lose your bookmarks and other personal data.