Rated 5 out of 5 stars

Worked very well in Thunderbird 3.0.x just like in firefox. But doesn't work in TB 3.1.x. But where is the update for 3.1.x???I bumped the version and fixed the script to make it work with TB 3.1.x, the chrome\CloseTabByDoubleClick\content\CloseTabByDoubleClick_Overlaytb.xul has to be changed. The problem is in the isTab function, just replace with the following:
isTab: function(node) {
if(node.localName == "tab")
return true;
for(; node; node = node.parentNode)
if(node.localName == "tab")
return true;
return false;
},


I also had to remove some strange characters from a comment in the clicked function (think it should be some russian words).I now have to check if it still works in TB 6.x which i will upgrade to now.
And it still works in 6.0.2. :)