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I get "operation cannot be completed because you do not have sufficient privileges for some of the items" since upgrading. Won't work at all now and won't let me go back to an older version

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crashes if I try to open it although it says it stopped before updating older version. Tried installing 3.6.19 but get the same error message so can't do that either

crashes if I try to open it although it says it stopped before updating older version. Tried installing 3.6.19 but get the same error message so can't do that either

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If you have problems with updating or with the permissions then easiest is to download the full version and trash the currently installed version to do a clean install of the new version.

Download a new copy of the Firefox program and save the DMG file to the desktop

  • Trash the current Firefox application to do a clean (re-)install
  • 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.