Many site issues can be caused by corrupt cookies or cache.

• Clear the Cache and

• Remove Cookies

Warning ! ! This will log you out of sites you're logged in to. You may also lose any settings for that website.

Type about:preferences<enter> in the address bar.

• Cookies; Select Privacy. Under History, select

Firefox will Use Custom Settings. Press the button on the right side called Show Cookies. Use the search bar to look for the site. Note; There may be more than one entry. Remove All of them.

• Cache; Select Advanced > Network. Across from

Cached Web Content, Press Clear Now.

If there is still a problem, Start Firefox in Safe Mode {web link} A small dialog should appear. Click Start In Safe Mode (not Refresh). While you are in safe mode;

Type about:preferences#advanced<enter> in the address bar.

Under Advanced, Select General. Look for and turn off Use Hardware Acceleration.

Then restart. Poke around safe websites. Are there any problems?

Thanks Fred, but did not help. There was no "Use Hardware Acceleration" to be found, so don't know about that. This seemed to happen after a recent update. Is there a way to return to previous version?

https://support.mozilla.org/en-US/kb/install-older-version-of-firefox?cache=no Be sure to read everything here.

If you still want to downgrade, look under; I still want to downgrade. Click the Directory of other versions and languages link. Look for the directory of the version that you want. But, remember that old versions may have security issues.

You should also check out Firefox; Extended Support Release https://www.mozilla.org/en-US/firefox/organizations/

https://www.mozilla.org/en-US/firefox/organizations/notes/

https://www.mozilla.org/en-US/firefox/organizations/system-requirements/

If you do it with the keyboard -- click in the field and press the down arrow to move among items on the autocomplete list -- does Firefox show a selection bar or are all the entries just black on white, no distinction?

I've noticed the same issue after a recent update to Firefox. I just tried your suggestion to use the arrow keys to highlight the entry, and that worked! I was able to delete it.

However, it was much easier when I could just use the cursor to highlight the entry, the way I can still use the cursor to select the entry I want to use in the form. This is a bug which Firefox needs to fix.