Seems to be outdated and the support email bounces.

It is not working anymore, I have the "block last active indicator of the chat" and even that every time I visit Facebook people can see I'm there .... shame ... it was working until 2 days ago but not anymore. Firefox 59.0.2 (64 bits) mac it seems every time someone send me a message it reset the time indicator to 1 minute ...

The privacy policy on the website says it collects information (the website or the extension?). The 'Contact us' and 'Contribute' links don't work either, links that would provide useful information.

Before I was using Unseen (https://addons.mozilla.org/en-US/firefox/addon/unseen-fb) but this add-on hasn't got a button like FB Unseen. Good job!

By the way, the popup menu has got a bug, the label of all 5 options points to the first one. If you want to check/uncheck some of the other options you'll need to press the check square, its label won't work.

EDIT: after using the version 2.0 for a few days I had to remove it because Facebook messages stop coming when the add-on was enabled. On Firefox 48 on Windows 10 when using the Facebook small chat windows I could send messages but I couldn't receive them having to do a page refresh to see them. What kind of huge bug is this? I've downgraded the rate from four to two starts. I'll carry on using the old Unseen until new releases of this extension.