Earlier quoted context omitted.
In that case, could the XUL dependency be removed from Thunderbird?
Unlike the original parent post I don't think this announcement anything to do with XUL. Thunderbird just doesn't have the userbase Mozilla expects it to at this point because, surprise, the people who want an email client are a small subset of the people who want a web browser. This is lost in a sea of replies now but I'm sure pissed off Mozilla is completely losing their root mantra of fighting for the free web. Pe…
This is one of the reasons why iPads have stalled - pro developers can't make money, for well documented reasons. The web equivalent will be the starving of open communication, thought and creativity, leading to homogeneous noise as a poor substitute for ground-breaking content.