This comes so close to being a 5 star useful extension, but the notifications aren't persistent, so if you aren't sitting there and watching the second it pops up, you will miss it. :-( I would be happy to help make the update to this (I'm guess setting "requireInteraction" to True would do it) but I'm not able to find the source anywhere. I tried contacting the author but the web site listed returns an error. If it would be possible to make this update, I would enthusiastically update my review to 5 stars.

cool addon - especially with the KDE Connect ^_^, and I'd love to score 5, but...
scoring only 3 because options do not take effects. in another words: addon currently non-customisable (2017-12-01).

Thanks

Ya no tiene opciones de configuracion como antes, pero creo que funciona igual

Great extension, so easy to use ! Thank you!

Thanks you for this outstanding Add-on. Working perfectly without any difficulty,

A fantastic add-on that provides exactly what I need. No need to install additional notifier add-ons that require you to log in etc. This capability should be in the browser as we move to doing more through browsers. Almost like a Growl/Snarl system for browser tabs.
Excellent thinking and great job. Well done and many thanks!

This extension would be very useful if it works well - and if can be customized for the sites/pages I would only want to be notified .
I installed it and it does not work in my FF 50.1.0 win8.1:
1. I do not see any options/setings like in the older version.
2. I do not see any messages
3. I do not see any icon - maybe I am not supposed to...
4. there is no parameter tabnotifier in about:config
I re-installed it a couple of times - same ;-(
I see it works for others...what do I have wrong?
UPDATE:
After re-install 3rd time I get messages - BUT I have:
NO add-on icon, NO disable button on the message (so I cannot disable a page notifing me) and NO options to change (in add-on page). What is it wrong? I use NoScript - does it interfere?
Thank for any help!

It`s good and useful add-on. The advantage this add-on is compatible with Windows and Linux.

Great addon, in order not to miss important events on Internet resources. Thanks

Yes, it's working again but the problem is in my version of Firefox (49.0.1 on Linux Ubuntu) the corner icon to suppress further notifications doesn't appear.