I've mostly been using the chromium-based Brave Browser which is Chrome without the advertising engine plus a built-in adblocker. Requires going through the settings once to enable that. There's a very decent android-only browser that does much the same, called Bromite. (Brave has a mobile version but Bromite is developed from scratch for Android, and is stable & supported).
Firefox is made by Mozilla Corp., which is for profit. Brave is fully FOSS as well. And Mozilla as a whole is a useless, unless we're talking about their ability to take Google's money (money which comes from Google ad businnes, in the end), raising the CEO paycheck and firing devs and making FF shittier with each forced update.
Very... Brave of you saying that here. For me it's the best browser out there as well, right now. Be prepared for a cascade of downvotes from Mozilla's shills.
I run my own DNS so can easily see attempts to phone home, and serve ads. I get less of both those things than I used to get with Firefox and its 'Sync' routine. I feel more secure with Brave Browser than I do with Firefox but I have no axes to grind and am perfectly happy using Firefox onsite when it is called for. Little performance differences. Marginally, Brave is better.