> Currently the only way is that the sellers of the adverts you read give money to fund Firefox.
According to Wikipedia[1], most of Mozilla is funded by Google, for setting them as the default search engine, rather than by more conventional advertisers.
On a more personal note, I'd prefer if that money went towards improving their FOSS offering instead of giving the now-former CEO a $7M bonus[2], acquiring advertising businesses [3][4], and littering Firefox with these anti-features.
Yeah I think the biggest problem is that Mozilla was made a corporation, and as such has corporative aspirations and mindset. It would have been much better if it had remained just a foundation.