hello, can you try to replicate this behaviour when you launch firefox in safe mode once? if not, maybe an addon is interfering here...

Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems

Behaving as expected now. Must have been an add on that didn't play well.

Jimjen said

Before the update, the address bar had the links to the pages that I used the most. Now it only shows the address of tabs that I currently have open (even across multiple sessions). Possible clue is that every address is preceded by "moz-action:switchtab," and then the address. Never saw that until this started happening. Odds are very good that it's something I missed, but it doe have me stumped.

Note that you can remove switch to tab items in the location bar drop down list by removing the checkmark on "Open tabs".

• Tools > Options > Privacy > Location Bar: When using the location bar, suggest:
  History
  Bookmarks
  Open tabs