When typing in a search box, I can't go back and retype a mistaken letter. I get a beep instead. How can I fix this problem?

I am not very technical when it comes to computers. I'm having a problem with Firefox that when I type in a search field or box blank of any kind, sometimes I want to go back inside it and change something before I hit return. But once I've typed it, I can't go back to change anything. I hear an annoying beep each time I press a key. If I go elsewhere on the page and click on another search field window and then go back to the original field to try to type, sometimes I can, but only if I backspace from the end of what I wrote backwards to the area I wanted to change. It is extremely annoying, and I am frustrated with Firefox. My family doesn't have this problem on their computers with Firefox, only me. I don't even know how to uninstall the Firefox add-ons that could have caused this problem. I really need a step-by-step direction how to fix this problem, if you could guide me. Thank you for your help. It just happened again. I wanted to modify something I typed, and I got that beep again. Help!

Start Firefox in <u>[[Safe Mode|Safe Mode]]</u> to check if one of the extensions (Firefox/Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/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

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