See this search for remove onlineMapFinder how-to articles.

I followed directions... went to Foxfire browser, chose tool menu, then options...

but when I try to change the home page URL it will not change... continues to be the URl for onlineMapFinder... tried reverting to earlier home page and onlineMapFinder comes up... tried to delete it... but still comes up.

Feel like I've lost any control of computer.

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.