[Enigmail] Off Topic: Where do I start learning about XPI?

[Faramir]

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I am sorry for bringing this question here, it is not related to enigmail.

I'd like to know where should I look for info about how to develop an
XPI addon for FireFox... I know almost nothing about the subject, and
google disappointed me this time... I found too much info, but it seems
most of it was not useful for a newbie (I mean, I found things about how
to modify FireFox itself... and a lot of other things, some said they
were almost deprecated...). Actually, I just need to remove a bug from
an addon, which started with FireFox 3 (it worked perfectly with FF2,
and in a specific circumstance, it still does with FF3. In other
circumstances, it generates a security error, and crash).

 Unfortunately, both the project owner and the "current" developer are
MIA, so it seems someone else will have to do something... and the
license is GPL, so it should be ok to pick up the project... at least
while the official "team" comes back from wherever they may be... I
don't have too much hope of success, but at least I should try.

 Best Regards, and sorry for the OT.
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