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CloseDeveloper reply by Achim Seufert
Rated 4 out of 5 stars
Why your addon ask new permission?
The last is to communicate with software outside Thunderbird.
This addon is really good but don't ask too many permission.
Why you need to read AND modify the address book?
Please check the FAQs:
http://mozext.achimonline.de/signatureswitch-me.php#faq
There also is a detailed changelog:
http://mozext.achimonline.de/signatureswitch-me.php#changelog
Plus, the source code of the add-on is also freely available:
https://github.com/4ch1m/mozext/tree/master/signatureswitch-me
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