Thunderbird 2: My own extension

Today I discovered that my own extension to Thunderbird did not really run under TB2. I did a little debugging this evening and found the problem:

document.popupNode.getTextAttribute('emailAddress')
no longer works; did fine, though, in Mozilla and TB1.x

I had to replace it with
document.popupNode.getAttribute('emailAddress')
and it now runs perfectly again.

I know this is not really of great interest to most of you, but since I found no reference at all to this behavior through Google, I thought, I'd document it here.