Reply To: Firefox contaminated with Yahoo
That is Mozilla’s marketing/revenue agreement with (what is now) Oath, which was in effect after their agreement with Google expired. I’m not sure they intended the search engine selection to be not remembered.
Out of curiosity, are you using Classic Theme Restorer? I can’t stand Australis, especially the behavior of the search bar. CTR brings back the old search bar behavior of pressing Alt-downarrow then the uparrow and downarrow keys to change which search engine is in use (from the list), and keeps the selected search engine until changed again (even across FF invocations).
It’s too bad that in all likelihood, CTR will cease to function past this November when FF 57 will be released.