DOM Inspector 1.8.1.2 Requires Restart
by Scott MacGregor
Inspect the DOM of HTML, XUL, and XML pages, including the mail...
About this Add-on
Reviews
Rated 2 out of 5 stars
Not working with TB 6.0.2 :-( :-( :-( ... then I found DOM Inspector 2.0.10 :-) that works... the TB Addon Developer docs point here, so I expect that need fixing.
Rated 3 out of 5 stars
If you're looking for similar functionality with FireFox, you should of course use FireBug: https://addons.mozilla.org/en-US/firefox/addon/1843
Rated 5 out of 5 stars
You can get the one for Firefox at https://addons.mozilla.org/en-US/firefox/addon/6622
(Giving a rating of 5 to balance out the comments about it not working in FF since it is for Thunderbird, but it is confusing)