uBlock Origin. The easy customizability of web applications is why I prefer them over other proprietary applications when there are no open source choices.

In this particular case, if the whole UI is irredeemable, you can access your mail with IMAP or POP.

> uBlock Origin.

I did try this without success.

> if the whole UI is irredeemable, you can access your mail with IMAP or POP.

I access my mail across a doz machines - and I support scores of users. Setting up stand-alone/3rd party clients (at scale) is a bit unwieldy.

The bad actor here turns out to be the Chrome browser. Every other browser behaves better in this.