It's good, but when ActivityWatch's server is down/not launched, this addon keep collecting data and ends up very large memory usage.
Also, it seems like this addon causing large amount of disk i/o after pc waking up from sleep.
It would be helpful to have parameter to limit this behavior.

Great! Please add an option to disable notifications as I sync my extensions across devices and not all of them have AW installed

Good but if there was a video on how to use it, it would save a lot of time in reading the documents.

Seems to track perfectly once the server is running but doesn't do much to tell you if it can't connect to the server (except for a popup).