add a live HTML validation error/warning indicator to your Firefox statusbar Nick wrote on 2005/02/25: Did you install it? When I try to install it, it says 'not a valid install package'. :( Milo wrote on 2005/02/25: No problem here; and I happen to have the exact same Firefox version as you. Nick wrote on 2005/02/25: The plugin was installed OK, but it still gave the error on installation... how weird! huphtur wrote on 2005/02/28: I noticed switching tabs is rather slowed down when using this extension. Milo wrote on 2005/02/28: Yeah, that might be why I've disabled it again... still handy while testing though.