Firefox 53 Asking to Restart to Update Endlessly

Solution 1:

Firefox's own support pages are finally back online after their migration to Moz://a.
This link explains my issue and offers the correct solution, which is as follows:

  • Delete the folder "Mozilla" residing in /Users/<user>/Library/Caches/
  • Restart Firefox.

The dialog should no longer pop up each time the program is launched.