Yeah I expect that would be the case but I honestly think out of all the other longterm rivals with deep pockets, bing is firefox's best chance of maintaining most of it's current userbase and maybe even growing it in the longterm especially if bing ai's features keep expanding. Else why would bard be a thing if google didn't feel a bit threatened. Again just my thoughts would like to hear what other opinions are out there.

Edit: would also be a big win for microsoft since a respectable browser is now using it's search engine and not just a butt of the joke like edge is, so maybe firefox can leveage a good chunk of change from them to keep their browser running for a while unlike the deal they did with google. Think it would ultimately destroy edge though but since edge can now be user uninstalled thats bound to happen in a couple of years anyways and with this deal bing will still get some traffic so still a win for microsoft.