How to hide e-mail signature in Thunderbird

I'd like to know if there is a way to auto-hide e-mail signatures in Thunderbird (setting or extension). Ideally, it should only show a line with some text like "Click here to display signature".

It's pretty annoying when in an e-mail thread some people write 2-3 lines of content and have 15 line signatures.


The 2.8.1 version of the Thunderbird Conversations extension claims to have the ability to collapse signatures by default.