Glen try resetting Firefox. Firefox sync, across devices is so handy that, if there is a simple fix that doesn't mean renewing passwords, bookmarks etc., it is worth trying.
You could uninstall it and re-install (but save bookmarks as a .json file and reload them afterwards).
Hope you get it resolved quickly
Trev
https://support.mozilla.org/en-US/kb...-most-problems
Quote:
What does the reset feature do?
All of your Firefox settings and personal information are stored in a profile folder. The reset feature works by creating a new profile folder for you while saving your important data.
Firefox will save these things:
- Bookmarks
- Browsing history
- Passwords
- Open windows, tabs and tab groups
- Cookies
- Web form auto-fill information
- Personal dictionary
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