Old behavior wanted

Could you put back the old behavior : when there is a new message, if you Lclick on the icon it opened right away (new tab(s) to email(s)) instead of opening a menu and then you need to click "open" or the email. Basically assign "open" to Lclick of icon?

If we need to access the options, we could easily go through the add-ons manager of Firefox. Once set, you rarely access the options menu.