Fork Firefox, bundle uBlock Origin, Sponsor Block et el and sell it is a consumer web security product (that's not complete shit) with a monthly subscription. Use some of the proceeds to support the devs working on the underlying tech, similar to what Valve are doing for Wine, Proton and Fex.

Bonus points:

1. Multi layered approach to dealing with ads and other malware.

2. A committment to no AI or other bloat - that's not what I'm paying you for.

3. Syncable profiles.