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Are you talking about the home page? https://support.mozilla.org/en-US/kb/how-to-set-the-home-page
Or the search engine?
Type about:addons<enter> in the address bar to
open your Add-ons Manager.
Hot key; (<Control> [Mac=<Command>] <Shift> A)
In the Add-ons Manager, on the left, select Extensions. Remove “ Bing “ Anything.
Also remove SafeSearch, SearchAssist Incognito, FileConverter Addon, SearchLock, DiscreteSearch, WebSearch, Findwide Search Engine, securedsearch
Now do the same in the computer’s Programs Folder.
Windows: Start > Control Panel > Uninstall Programs. Mac: Open the Applications folder. Linux: Check your user manual.
You may have to start Firefox in Safe Mode to be able to disable the extension that is the culprit.