Unlike the original parent post I don&#x27;t think this announcement anything to do with XUL. Thunderbird just doesn&#x27;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.<p>&lt;rant&gt;<p>This is lost in a sea of replies now but I&#x27;m sure pissed off Mozilla is completely losing their root mantra of fighting for the free web. Persona, Thunderbird, two critical components of a &quot;free web&quot;: free global authentication, free email client. I&#x27;m sure next mozfest the same suits as every year will talk about how they&#x27;re so proud of &quot;keeping the web open&quot;. What a crock of crap. Firefox isn&#x27;t even that good of a browser anymore.<p>&lt;&#x2F;rant&gt;