A lot of articles on the Internet are devoted to the question of how to get to the link “display in a simple html form”, and how to deal with the fact that the view periodically returns to “improved”.
Quite by chance, experimentally, I installed and tested a link that gives a 100% guarantee that mail will open in html form.
https://mail.google.com/mail/u/0/h/
That's all. Guaranteed to work, you just need to log in to Google. Once he asks if you are exactly ready to use such an interface.
All, but not all - the reader will answer. But I can have more than one mail.
Yes, with several inputs in the “improved” form there is a “switch accounts”
But in a "simple" form, everything works even easier - through a counter.
Let's say our main account is habrauser@gmail.com, and we also logged in webdev@gogle.com, and then forspam@gmail.com
then for webdev the link would be:
https://mail.google.com/mail/u/1/h/
and for forspam:
https://mail.google.com/mail/u/2/h/
and so on for other google-mails.
But if we log in in a different order, then the number between u / and / h / will correspond to the boxes in the login order.
This is not entirely convenient, but bearable.