People who complain about this seems unaware that mozilla can't make money from thin air. You don't pay for the browser, so.... Put 2 and 2 together...
If you would actually consider paying for software you use all the time, companies could make quality stuff.
I would pay 5 dollars per month for Firefox, no problems. I don't like subscriptions but I would do it for Firefox. Been using it since the very first version of Firefox came out.