I think Chrome, Edge, and Brave are all Chromium-based, so you won't need to switch. You can use Chrome Mask on Firefox for such sites: https://addons.mozilla.org/en-US/firefox/addon/chrome-mask/

Edit: I researched a little more. For typical users and use cases, Firefox works ok (better with privacy extensions). What the article describes is more like browser-engine-based targeted attacks.

I created this custom keymap that goes well with EXWM: https://codeberg.org/hermitsings/Kmonad_ISO_keymap_for_minim...

This is to reduce lateral wrist movement (to protect from Carpal Tunnel) and general finger movement. Just posting here if folks wanna check it out.

Is there a visualization of the layout somewhere?

Yup, the files in the repo--the layout is in there.

It's currently for ISO keyboards (I have ISO), but you can modify it for ANSI!