Hi

I am going to close this thread as it appears to be a duplicate of:

https://support.mozilla.org/en-US/questions/1427589

I'm unlocking this thread and have locked the earlier thread because this thread has more text.

Hello. I got 2 different replies, but no answer to my question. Here's the question again. I've had computer for 9 yrs. (new) and always had FIREFOX. This morning it was BING!!! I don't want BING. I want my FIREFOX back!!! FIREFOX is the BEST!!! Please HELP. Can you please walk me through getting it back? I don't do anything "fancy" on the computer. I just turn it on and off. I'm old. Maybe I hit a key by mistake. I don't know. Thank you for your help. I'm truly grateful.

You can check for recently installed suspicious or unknown extensions.

Start Firefox in Troubleshoot Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration or if userChrome.css/userContent.css is causing the problem.

• switch to the Default System theme: "3-bar" menu button or Tools -> Add-ons -> Themes
• do NOT click the "Refresh Firefox" button on the Troubleshoot Mode start window

• https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode
• https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems

You can do a malware scan just to be sure.

• https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-caused-malware

Ohhhhhh cor-el you're so nice. Thank you for getting back to me. BUT!!! can you please "explain it to me like I'm 5 years old?" I don't know where my "Firefox Trouble Shooter Mode" is. I KNOW where those 3 bars are, and I looked inside, but I don't know what I'm looking for, and then if it's bad, how to get rid of it. Can you please help me? I don't know anyone who knows about computers. They either moved or they died. I really don't care if you "spell it out" like I'm a 5 year old. Honest. I'm the ONLY ONE that uses this computer and I NEVER take it outside. Thank you for your kindness. I'm just someone who doesn't understand.

You can start Firefox in Troubleshoot Mode to see if that works.

• Windows: hold down the Shift key while starting Firefox

Did you read this article?

• https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode

We regularly get questions about Bing being invasive on Windows and usually this is about an extension that got installed and that changes the default search engine. Malware also can do this.

• https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems