further info for this bug in bullseye live session I installt thunderbird and opend a link from an e-mail and set firefox as default browser in firefox over about:preferences.
before this gio mime x-scheme-handler/http Standardanwendung für »x-scheme-handler/http«: firefox-esr.desktop Registrierte Anwendungen: firefox-esr.desktop Empfohlene Anwendungen: firefox-esr.desktop sorry I forget before to change my language to english After changeing firefox to default browser in about:preferences gio mime x-scheme-handler/http Default application for ?x-scheme-handler/http?: thunderbird.desktop Registered applications: firefox-esr.desktop thunderbird.desktop Recommended applications: firefox-esr.desktop thunderbird.desktop why i havens name is thunderbird registert as application for this mime type. This does not make sense for me. Note firefox with claws mail has not this stupid side effect. Do firefox and thunderbird share some code?