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This addon does exactly what it says: it shows a clickable link to Google Groups where the message can be read.

I'm not sure what it "requires" Mnenhy or Enigmail for, as I have neither of them and it still works smoothly.

For bluebloy56: the link is in the email header information above the message content, where one can read the expediter email address, the message date... It shows up only if you don't pack it on a single line (using the arrow on the left of the subject).