You can't, that is how it works on Linux. *https://support.mozilla.org/en-US/kb/keyboard-shortcuts-perform-firefox-tasks-quickly *https://support.mozilla.org/en-US/kb/mouse-shortcuts-perform-common-tasks

''<p>cor-el [[#answer-1679748|said]]</p>'' <blockquote>You can't, that is how it works on Linux. *https://support.mozilla.org/en-US/kb/keyboard-shortcuts-perform-firefox-tasks-quickly *https://support.mozilla.org/en-US/kb/mouse-shortcuts-perform-common-tasks </blockquote> Unfortunately, I'm using alt as my Mod key, and I'm sure some Linux users too. I used to use ctrl + numbers for switching tabs. Is there any option in about:config to use ctrl instead?