After a year, added large display advertising to individual emails in my inbox. Without asking. This extension is used to add a "notes" field to every email in Gmail. I know it is this extension but it is adding 2 advertisements for their products: Trying to get me to subscribe to the pro version and also another extension they make called Simple CRM.

I've been waiting for this for many years!

Terrific! I waited this possibility for years!

This is a must have gmail addon. We couldn't do without it.

I am so very happy I have discovered this. I have no idea whether it is going to be buggy, etc - what I do know is that it finally allows me to master my inbox, showing me notes on top of subject lines WITHOUT MY NEEDING TO OPEN MAIL! So easy and convenient.

This is by far the best extension I have used for this. I use it constantly and will even pay for it if I needed to. Under active development which means that any bugs get fixed quickly.

today its not working

Great app, excellent support. Keeping up with browser and gmail changes is not easy. Invaluable app for the way I use gmail.
Now end-March 2020 - still invaluable to me.
Firefox required the developers to jump through hoops recently on security and other issues. No problem.

This app has worked for me quite some time. Out of the blue, the add-on no longer appears on Gmail. I have refresh Firefox, uninstalled, reinstalled the add-on to no avail. I am running Firefox 65.0.1.