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The behaviour I see is quite different, the plug-in does not work but the message I get tells me I have Javascript disabled.
I have already enabled cookies from anyone, it was no good

Update: setting javascript.enabled to true - as suggested by Philipp - did work. Thank you. Could be that the last TB update reverted the boolean ? (BTW javascript.enabled is safe, it does not enable javascript in email)

Это отзыв для предыдущей версии этого дополнения (3.1). 

Please go to the advanced config editor and check if javascript.enabled is set to true. You can find it in the Options > Advanced > General > Config Editor.