Firefox 35.0.1 does not install, despite repeated attempts in OS X Yosemite.

Running Yosemite 10.10.2 on a Macbook Air, have downloaded and installed Firefox 35.0.1 several times. Software says installation was successful each time, but it does not seem to register, and I keep getting prompts to install it.

If there are problems with updating or with the permissions then best 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 application and save the disk image file to the desktop
*Firefox 35.0.1: https://www.mozilla.org/en-US/firefox/all/
*Trash the current Firefox application (open the Applications folder in the Finder and drag the Firefox application to the Trash) to do a clean (re)install
*Install the new version that you have downloaded
*https://support.mozilla.org/kb/Installing+Firefox+on+Mac
Your personal data is stored elsewhere in the Firefox profile folder, so you won't lose your bookmarks and other personal data when you uninstall and (re)install or update Firefox.
*http://kb.mozillazine.org/Profile_folder_-_Firefox

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