I'm often at the receiving end of angst about the business model funding #Firefox.
They do need to FUND the underlying web engines #Gecko & #Servo. Mozillians argue about implementations behind the scenes more than you do here. Why do you think we have such strong participation guidelines?
Go for a fork that resonates if you need. Waterfox, IceFox, there's loads! FOSS FTW!!
But consider donating to Mozilla and help support the only TRUE alternative to Google's "Blink" and Apple's "WebKit".