https://support.mozilla.org/en-US/kb/how-to-fix-preferences-wont-save

Note: Some software, like Advanced SystemCare with Surfing Protection, can protect files in the Firefox profile folder against changes. If you have such software then check the settings or uninstall this software.

Used:

Remove a toolbar that has taken over your Firefox search or home page

Got rid of the annoying "My Quick Converter" page Don't know where it came from, but sure didn't like it THANK YOU

It’s very sad, but many software downloaders/ installers will trick you into installing not only their program, but other programs as well.

You have heard of the fine print in shady contracts, right? Well, some installers you need to look at the itsy bitsy teeny weeny fine print.

You are thinking you are giving the installer permission to install the program you want by using the recommended option. But if you use the Manual Option Instead, you discover all kinds of stuff that you do not even know what it is or what it does.

From now on, everyone needs to Use The Manual Option to put a stop to this.

Note that these programs can also change browser/computer settings.

Excellent advice FredMcD , as I was almost ready to give up on F F. The people I work for via Computer wants me to use Google & I have refused to use Google, as I do not like the company. Have been using F F for years & have liked it, but updates & some of the hoops one has to jump thru to keep safe is getting annoying. THANK YOU very much for the help

Glad to help. Safe Surfing.