Open a new browser window just for that tab. Presto, that tab is always active, even if that window is underneath another window. In Firefox you can drag'n'dro

Open a new browser window just for that tab. Presto, that tab is always active, even if that window is underneath another window. In Firefox you can drag'n'drop a tab "out" of the tab bar, which will move it to a new window. Might work in other browsers too.