Type about:support in the address bar and press Enter. Under the main banner, press the button; Copy Text To Clipboard.. Then in the reply box at the bottom of this page, do a right click in the box and select Paste. This will show us your system details. No Personal Information Is Collected.

Did you look in "Firefox/Tools > Add-ons > Extensions"?

• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

Hi Fred. Thank you for your reply. Unfortunately, I cannot even access the address bar in Firefox. In fact, like I was saying, I can't do anything in Firefox at all, other than look at my homepage in full-screen. All I can do otherwise is ctrl-alt-delete and close Firefox.

Do you have another suggestion?

Hi cor-el ... Same reply to you as to Fred. I can't do anything at all in Firefox except look at the homepage in full-screen.

Try to rename (or delete) the xulstore.json file in the Firefox profile folder.

• http://kb.mozillazine.org/Profile_folder_-_Firefox

You can check if you can start Firefox in Safe Mode by holding down the Shift/Options key.

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem.

• Switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance
• Do NOT click the Reset button on the Safe Mode start window

• https://support.mozilla.org/kb/Safe+Mode
• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

Hi cor-el ... That seems to have done the trick!! Thank you so much for (a) solving my problem and (b) replying so quickly!!!

Take care!

You're welcome