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I was able to fix the suggestion pop-up using this:
https://github.com/alainfrisch/nostalgy/issues/10#issuecomment-99588036

* Make the Thunderbird window less high by dragging the window smaller from the bottom of the window
* Hit "g" and type something
* Quit Thunderbird
* Start Thunderbird
* Now it works (even after a restart and resizing the window again)

这个评论是针对附加组件的一个早期版本的(0.2.33)。