Currently, I use 2FAS as 2FA solution. It works great and I recommend it :)

The reason I currently won't switch is because of their browser extension. I don't want the 2FA available on any other device than my phone - otherwise it won't make sense to have the 2FA in the first place. Instead, please create a browser extension similar to the one 2FA has that allows me to link the extension to the phone's app and allow to enter the 2FA on the website only when I allow it in the app.

As alternative to how it's done with 2FAS, you could e.g. allow me seeing my 2FA's from the extension itself, but hide the code. Only after unlocking the app, the codes get visible/copyable for e.g. 60 seconds, after which the codes are hidden again. :)