Welcome to Thunderbird Add-ons.
Add extra features and styles to make Thunderbird your own.Itxi
Gehigarri honi buruz
Select a message, hit ALT+Q, start typing. TAB works to select options if you want. On OS X change the shortcut to CONTROL+Q since that appears to work.
You can resize the dialog if it's not big enough for you, and Quickfile remembers this for next time.
Quickfile 0.17 is awaiting approval. You can get it beforehand at http://quickfile.mozdev/org/