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CloseReview for Copy Plain Text by NielsH
Rated 5 out of 5 stars
I've posted it some reviews ago (and will post in a separate, new extension tomorrow -with all credits to the original developer!).
You can download an adapted version of this extension which will work for 3.5.2 at - http://rapidshare.com/files/267634366/copy_plain_text-0.3.3-fx_mz_tb.xpi
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