It's probably better to compare Firefox to Chromium which is as free as Firefox. I think the RAM and address bar comparisons could be addressed by extensions in

It's probably better to compare Firefox to Chromium which is as free as Firefox. I think the RAM and address bar comparisons could be addressed by extensions in Chromium. So really you are left with the last point about funding, but Mozilla gets its money somehow and it's mostly not coming from charitable donations.