Firefox has effectively become spyware, and so, yes, it should be replaced. There are several forks that work well. I’m using Floorp (stupid name, but really nice with some improvements over vanilla Firefox). Zen is another one gaining in popularity. Try them out! Don’t let Mozilla walk away with your data.

• Just like Google it has an app and a web interface. Seeing that OP is looking to replace Google and didn’t mention self-hosting, this seems a good fit.
• Proton does provide e2e encryption.
• What does US citizens using it have to do with anything? Proton is not based in the US.
• Your last point is a maybe and remains to be tested in practice. If this is a concern, then take it into account.

For me personally it is more important that my data doesn’t get mined by a big company, and that I use European services as much as possible, and preferably open source. Proton is a good fit for me, and may be for OP.

I like Proton. It’s secure, with end-to-end encryption. It is web-based, just like Google, so accessible anywhere. It has an eye-pleasing design. And it’s based in Europe.

Oh, it’s perfectly clear. We got the message. Mozilla are not to be trusted with our data.

He didn’t melt down. This was a performance, theater, or as he himself said: great television. It was a planned insult and betrayal of Zelensky. Putin couldn’t be more pleased.