proton-mail VS webclient

The linked site is very low on info high on outrageous claims. It is not the same as gmail and protons response to that paper are accurate imo. The fact is web clients are inherently insecure but you can run your own client entirely afaik (https://github.com/ProtonMail/proton-mail). I don't think anybody has evidence of wrong doing but the service is proprietary so...

I was switched from beta to stable release but saw another update and when I clicked on it, I was reverted back to the old design and couldn't find a switch to go the beta again. I had to use beta.protonmail.com address to go back to the beta. The information you have written in comments below is inaccurate. I'm a bit disappointed by this.

The new web app has been open source for a while already and can be found here: https://github.com/ProtonMail/proton-mail

Well, to log to beta you can simply go to beta.protonmail.com when needed.

If you want it to, you check check out the beta version (beta.protonmail.com) - that offers the ability to stay logged in on the web.

For example, if I wanted to add beta.protonmail.com to a container, I am running into the issue where I cannot add beta.protonmail.com to always open in a container because as soon as visiting the site, it would redirect to https://account.protonmail.com/login. So the beta.protonmail.com would never open in a container tab, but then it would open the login page by opening a brand new tab.

You've been pointed at https://beta.protonmail.com/ already.

Hi! Have you checked out beta.protonmail.com? It has a sleek new interface, and we think the login page will be more to your liking :)

MEGA's webclient code is somewhere in here but their API is very opaque and unfriendly to third-party implementations, which is the main red flag that stands out to me about their service.