The built in browser on GrapheneOS, Vanadium, is great.
If they’re using Bromite, that’s a problem because Bromite ended development like a year ago, and they should at least switch to Cromite
Edit: A problem with all the plugins is that it creates a unique fingerprint, which Cromite and Vanadium prevent by not doing plugins/extensions and instead using built-in ad blocking (which can/should be supplemented with a decent VPN and/or DNS level ad blocking)
I used Signal for virtual sessions during the pandemic (the law allowed it then), and I would absolutely pay them monthly if I could switch back. I even thought about emailing them to ask about a BAA- as far as I know, their model means that it’s only paperwork that has to be done to call it hipaa compliant