I'd like to make a small comment / correction; Bisq has been around
since December 2014, with over 200 contributors and also connects through Tor by default.
However, I confess that it feels a bit more complicated than an instant exchange running in the browser.
The only trouble I have with Bisq is that the connection is unstable between Bisq and my Bitcoin Core node. It connects and disconnects every 5 seconds. Imagine like a blinking light that turns on and off constantly. I have bloom filters enabled etc.
I haven't figured out why, but this is not a subject to discuss here. Perhaps I will open a support topic in the future.