I have Mac. I have Firefox 38. I've been asked to update to 3.9, then to 4.0. I download the package and tell it to install it. It never completes.
I am continually asked if I want 40. I say yes. It's downloaded and then asks me to click to install. I click. Firefox restarts, but it never updates from 38. I've done this at least 20 times over the last two months.
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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 40.0.3: 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 personal data like bookmarks when you uninstall and (re)install or update Firefox.