Rated 5 out of 5 stars
The only addon that actually works as I want it, but the latest version doesnt show barcode created from links. The previous one still OK.
Install 2.0.3 from here https://addons.mozilla.org/en-US/firefox/addons/versions/2780
If you use a newer version of Firefox, you may need the "Nightly Tester Tools" addon to bypass the restriction.