set "browser.tabs.insertAfterCurrent" always on true or as an option in the settings menu

[dkeok]

opening new tabs next to the current tab with Ctrl+t increases productivity and it's a fast way to organize tabs in the first place.

on every new firefox installation, I have to go to about:config, search for browser.tabs.insertAfterCurrent and set it on true. Many users search for this but will never find it. It should be an option in the settings menu.