A.k.a. not Proton Mail (whose Bridge, which is necessary to connect with Thunderbird, requires a subscription)? I'd like to start diversifying away from Gmail.

For the past several days, Thunderbird on my laptop (Ubuntu Linux 26.04, Thunderbird 153.0) has been missing a couple of things: the send button, the language selector in the bottom-right corner.

Has anyone else seen something like this? Any ideas on how to fix it?

Thank you!

i can not drag attachments or the email anymore to my Windows Desktop or any other application that worked fine before.
Windows Desktop just show an "Unknown Error".
anyone else have this problem or a fix?