The OpenWengo extension for Firefox does not work in Fifefox 1.5.0.4 and I don't know yet why. Opening the sidebar triggers the following error that never happened with the previous versions of FF :

Erreur : uncaught exception: [Exception... "Component returned failure code: 0x80470007
(NS_BASE_STREAM_WOULD_BLOCK) [nsIProtocolProxyService.resolve]"
nsresult: "0x80470007 (NS_BASE_STREAM_WOULD_BLOCK)"
location: "JS frame :: [snip]/owWengoSession.js :: anonymous :: line 99"  data: no]

I'm on it.