Everyone who is running Chrome and do not want to ditch it should run Brave, its almost 1:1 better replacement. From a philosophical point of view, a good reason to run FireFox is not let the whole web run on the Chromium browser and its Blink engine. Its owned/influenced by Google and we don't want that. We want option and FireFox keeps FOSS, competition, and standards alive.
Of course to each his own, I am just saying.
There is a linux one, I am not sure if it works on OpenBSD, but last I heard many software can work on both.