Rated 4 out of 5 stars

Very useful addon, especially when you send a lot of emails that demand a reply. I used it a lot on a Windows machine.

However the addon seems not to be working on Debian in Icedove (TB) with Iceowl (Lightning). The addon installs correctly and preferences can be set. Even the toolbar buttons can be added. Only the checkbox within an email message is not visible. No errors are logged in the console.

Edit: problem in Icedove caused by corrupt profile. Addon works perfect in Icedove.

This review is for a previous version of the add-on (0.6).