Browsing Stats od Bartosz Klonowski

What is this extension for?
Each time you visit a website, the time spent on it is summarized when leaving, along with many other details of your browsing, such as: average time spent daily, number of visits, etc.
This extension calculates the time spent overall on each website you visited since installing the extension.

Please visit the add-on's website and README for more details

How does it work?
Once you visit a website the extension catches that moment and summarize the time spent on the website at the moment you are leaving. It also checks for all the information and calculates other details of your visits, which you can check in the "Details" screen for each website listed in the extension.
Please note, that this extension summarizes and shows the time spent for a website in general, not for a certain webpage.
For more details please check the official docs

Privacy
This extension is to allow user to track his time, not to gather any data for 3rd parties statistics, nor the author.
This extension does not sends any data to anywhere, but saves the data locally on your machine so that your data stays with you.