For me, the best option would be to be able to donate to Firefox engineers directly, but not to Mozilla, they do too many things, I don't stand for those, just the Firefox browser...
Firefox Support Edition, for $10 a month you get nothing (or maybe some Sync stuff) but all the funds go to Firefox exclusively, and your copy will show a pretty star on startup or something else.
Patron Edition: for $20 a month, same thing but you also get the VPN from Mullvad.
160M users. If 10% subscribe, you get $160M every month. I'm a marketing genius.
Can't tell whether you're serious or being sarcastic. A 10% conversion rate for a free product would be the most successful marketing campaign in history. Typical rates are in the low single digits, and that includes goods/services that people have no choice but to pay money for (eg. drop shipped goods from china or SaaS products).
And why "humanitarian aid" to countries at war allows budgets to be shifted to weapons instead of food and medical supplies.
Sometimes you just can't do the seemingly obvious "right thing"
Now if you buy a self serve coffee in a paper cup the cashier whose sole job is to take your money, expects a tip because their wages are shite.