Request 62195 (accepted)

This request supersedes: request 62193 (Show diff)

Wanted for 11.4 (if we want to get rid of xulrunner192 by default; I think we do): port to xulrunner20 + fixes for crashes/freezes

Wanted for 11.4 (if we want to get rid of xulrunner192 by default; I think we do): port to xulrunner20 + fixes for crashes/freezes

Looks good... I'd love to see that in 11.4... no more xul 1.92 :)