The DOM Inspector was checked in to the Mozilla Firebird trunk today and it should appear in tomorrow’s nightly builds. For those not aware, the DOM Inspector is the ultra-useful browser extension for — among other things — analyzing CSS within a webpage. For instance, you can select an element on a page and the DOM Inspector can tell you how the document’s CSS rules cascaded to produce that element’s styling.
I’m really stoked about this check-in since the missing DOM Inspector was one of the few things holding me back from Mozilla Firebird. Now if I can just get URLs from Thunderbird to open in a new Firebird tab, I’ll be all set :). And, some say that there’s a solution to the open-new-tabs issue as well.
I don't doubt that switching to Firebird/Thunderbird is a Good Idea(tm), but I'm still unsure when the development team will officially make the switch. Reading over the roadmap, they say that “[it’s] clear now that we will not be able to switch to Mozilla Firebird by the Mozilla 1.5 final milestone” — but they don't elaborate on when they expect that switch might be :-/.
Update 11-13: I’ve discovered that Firebird still doesn’t have inline autocomplete in the location bar (URL bar). Bummer.