I wish they'd just give me an ability to delete address bar suggestions/favorites like in the old days. One of their worst old bugs if you upgraded from a previous release.
1. Clicked in the URL bar. 2. Started typing something. 3. Arrow-keyed down to one of the entries under “Firefox suggest.” 4. Tapped Shift+Del.
The entry was gone and didn’t come back next time I typed the same thing in the URL bar.