Hello, I hope I'm in the right subforum. I have the following problem. In my system settings, Opera is set as the default browser, using the command "opera %U --lang=de." Unfortunately (despite the system-wide setting), when I want to open an https link, Thunderbird still asks me which application I want to use. Unfortunately, as is usually the case, I can't select one from the application menu (where the corresponding command is stored in Opera). Instead, I have to search for and specify the application in the /usr/bin folder. This logically opens the link with the "opera" command and not with the "--lang=de" option. However, Thunderbird doesn't accept a desktop file under "Open with...", where you could add the option. I've now created a shell file with the following content: #! /bin/bash opera %U --lang=de This opens the browser as desired when I click the link, but only with the home page; the link isn't passed. My question is, how would the command in the shell file need to be changed to open the link, or is there any way to get Thunderbird to open links with the command "opera %U --lang=de"? Thank you.