Rated 4 out of 5 stars

Very useful for quickly adding a reference to a specific emails in text files, calendar entries etc. :)

I have one feature suggestion:

An option to copy a GMail link instead of the bare message id.
That is, instead of XXX (the message id), copy
https://mail.google.com/mail/#search/in%3Aanywhere+rfc822msgid%3AXXX

(see https://stackoverflow.com/a/19247147/2646248)

This would allow to insert link in, say, calendar entries, and quickly look the mail up (assuming one is logged into the right GMail account).

This review is for a previous version of the add-on (1.0.1).