I have the same problem, only mine started yesterday. I didn't know you could right-click though, I always press the delete key. Anyway, it was right after another major problem was fixed (which started up again). I really hope this gets fixed.

Start Firefox in Safe Mode {web link}

A small dialog should appear. Click Start In Safe Mode (not Refresh). Is the problem still there?

This did not solve the problem: I cannot RIGHT click on the URLs in my address bar and delete them as I could in the previous version of Firefox.

Please fix this!

That was one of the main features I use most everyday! To revert back to the previously simple right-click/delete history from the url bar with just one tap using delete key on keyboard:

(thanks to courtesy of jscher2000 for the 'about:config' trick)

(1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button promising to be careful or accepting the risk.

(2) In the search box above the list, type or paste URLB and pause while the list is filtered

(3) Double-click the browser.urlbar.quantumbar preference to switch the value from true to false

OR,

If you do not wish to alter anything from about:config, with the new update, new method of removing individual history from the url bar:

• drop down the URL list,
• use the UP or Down arrow key from keyboard to highlight/select address,
• hold down Shift+Delete to remove your desired domain history from the URL bar.

Yes, more work I know.

Ah! Thank you so much (and to jscher2000 as well), it worked!