One might think that since browsing privately and securely is such a pain point, there would be more than one product (firefox) to solve the issue. Any HN entrepreneur types out there reading these posts?
Entrepreneurs go after money to survive, where is money in selling a private browser? Moreover, using some niche addon is a very nice signal to fingerprint one in the ocean of privacy-unaware users.
Practically speaking, you would have to use Chromium as a base, if you want the product to be successful. And if you do that, Google has a million ways to screw you up. One of the first obstacles you will find will be Widevine. Hardly anyone moves past that point.
Not sure why you got downvoted. Practically speaking, A fully fledged and compliant modern browser would require a team to build if not built off the back of another browser. So either you're a funded non-profit or you need to make money which doesn't seem compatible with privacy on the internet.
A lot of Tor nodes and endpoints are fairly small in terms of capacity and throughput. Streaming lots of porn vids through them eats up a lot of bandwidth compared to, say, writing emails or browsing darknet markets or reading about Tienanmen Square or something.
Tor has a place, but in most countries regular internet porn isn't seriously illegal. Save the limited Tor bandwidth for people that actually need protection, like gays in the middle east, victims of repressive regimes, etc.
Get a regular VPN, user-agent switcher, etc. for your pronz.
Au contraire: More traffic benefits exactly those who need Tor's protection, because it grows the anonymity set. Your streaming innocuous porn over Tor helps to provide cover traffic for e.g. "gays in the middle east" streaming highly illegal porn. Without this cover traffic, Tor would be utterly useless.
So please do stream porn over Tor. Bandwidth capacity on the Tor network is just fine these days, and your use of Tor helps all those who really need the privacy and anonymity Tor can help to provide.