The Samsung browser isn't actually that bad at all. Has some neat features that can't be found in Firefox or even Chrome, like the enhanced video playback tools. Plus it supports adblocking plug ins (though only FF has the much better ublock origin). Keep in mind that tons of website just outright won't work with Firefox mobile too, and it has a very annoying bug that has been known for years where all your tabs will very oftem reload whenever you switch to another app and come back. And that's regardless of how much free ram you have. Samsung browser just... Works.