Supporting Multiple Browsers

I have some experience doing web development for both Chrome and Firefox. I have a (very) modestly popular extension that supports both browsers and I try to get all the websites I make looking good in Firefox, Chrome, and Safari. Clearly, this can lead to some issues because supporting more than one (never mind 3 or more) browsers adds complexity and work to any web project. The alternative, though, is one where someone (probably Chrome) dominates and monopolizes the browser space. This is clearly not ideal for many reasons. Google's "approach" to privacy and ad-tracking is not optimal. Their ability to flout standards because of their market share (cf. Internet Explorer), and their ability to influence other browsers (such as with their seemingly effective attempt to kill ad-block extensions with manifest v3 is a marked downside of a browser monopoly. All the same, it would certainly simplify most web-based projects at least until 10 years from now when a new Browser war begins and we are dealing with whatever the Chrome equivalent of ActiveX controls are for the next 2 decades.