That won't help: donations to Mozilla don't go to the development of Firefox.
We can't just start donating massive amounts of money and hope that management funnels it to Firefox.
The same management that receives almost half a billion dollars per year from Google is the management that just fired Servo, MDN and Dev Tools staff.
More money is just going to incentivize their current malpractices.
I think what we could do is support a Firefox Foundation if/when it eventually exists.