This has been one of three esential plugins (the other 2 security-based) I have used without issue on both Windows and Linux synced copies of Firefox. As advertised. I dig it, other people dig it; you will - 'bets-on' - dig it too. Be a cool cat and kick some tabby-tab-tabs out of your resource reserves. Firefox could focus there too btw ;) Thank you Mr Neomy kind and generous gentleman he is ('bets-on' always is.)..