very COOL ! I had to switch my useragent on-the-fly to ff66 and back, to be able to write this with waterfox but it was worth it! this addon is doing a real nice trick, for demo see: https://support.mozilla.org/en-US/questions/1247067

click on a .pls link and have VLC launched without further ado!
Comes in SUPER HANDY! well done!