@thibaultmol Does it, though. I search "Thunderbird" and I find https://proton.me/support/protonmail-bridge-configure-client -> https://proton.me/support/protonmail-bridge-clients-windows-thunderbird/ . This page looks decidedly outdated or misleading, with its advertisement for "Proton Mail Bridge". Isn't that redundant, in newer versions of Thunderbird?
From https://proton.me/mail/bridge I see you can download a deb or rpm. Does it self-update afterwards by contacting Proton servers? It's linked to a personal subscription. Can French authorities ask a person-specific update?