BEFORE links on arbitrary pages.
Hint: It's much easier if you get ScriptInstaller, then navigate to User:Enterprisey/quick-before.js and click "Install" at the top.
However, here's the manual method:
((subst:iusc|User:Enterprisey/quick-before.js))
on Special:MyPage/common.js or a skin-specific page, like Special:MyPage/vector.js.Navigate to any page, and in the "More" menu you will see a "BEFORE search" option. Click it to open a panel with the ((Find sources AfD)) template customized with the current page name.