I like Supermium for two reasons - it runs on older versions of Windows (all the way back to XP) as well as newer versions, and although it's Chromium-based, unlike Chrome itself the Supermium developers have not removed support for Manifest V2 and have no intention of doing so. Manifest controls how browser extensions function, and Manifest V3, the current version that was rolled out last year, restricted permission grants much more than V2, rendering adblockers far less effective (or essentially non-functional in some cases). I switched to Supermium months ago from Chrome and haven't looked back - the migration process was dead simple, just like upgrading to a new version of Chrome.
Supermium
I also use FIrefox, but recently switched my default search engine to Duck Duck Go when Google started requiring Javascript to be enabled in order to perform searches. I have Javascript blocked by default on my Firefox install and enable it only on an as-needed basis (NoScript is my preferred extension for that use case), but I didn't care to do so just to be able to search with Google, given how aggressive they've gotten with force-feeding users ads.