This would be different for each desktop environment . We should say to launch the application from the applications menu on every DE except Unity and GNOME 3. On Unity from the dash or application lens (http://askubuntu.com/questions/10228/whats-the-right-terminology-for-unitys-ui-elements/19166#19166) On GNOME 3 from the application picker (https://live.gnome.org/GnomeShell/Design/#Application_picker).

Marco, thanks for all your work getting apps to work on Linux! the code for this is in a few places. It starts here in the template: https://github.com/mozilla/zamboni/blob/master/mkt/detail/templates/detail/app.html#L108 The JS code has most of the logic though, I think: https://github.com/mozilla/zamboni/blob/master/media/js/mkt/buttons.js#L60

How will the website know which DE the user is using? Gerv

https://github.com/mozilla/zamboni/commit/5f41763 Yeah unfortunately we don't know which IDE. Thanks, Marco, for your patience and the pull request! If anyone has any recommendations to how we can change this to be clearer, feel free to reopen with suggested copy.