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Even though this shows as "Enabled", I have to re-start it every time I start Thunderbird. By "re-start" it, I have to click on it to "disable" it and then click again to Enable it. It's a pain in the 'you-know-where'.

这个评论是针对附加组件的一个早期版本的(4.3)。 

You may have guessed: this is not what other users experience. If you contact the developer, he can have a closer look.