Issue reading thunderbird webextension documentaion

Hi all,

i try to understand this webextension example (line 2):

After reading the documentation:

I still have no clue, why (tab, messageList) is the correct argument for the event listener? Where can I get this kind of information? What did I miss to read?

Regards, Michael

The link points to the Thunderbird 68, if you check the current 78, you will see the info about those parameters:

But I agree that the Thunderbird docs are much harder to navigate than MDN.

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