How to make money online with browser extensions

The browser extensions are programs that are installed by the users in their browser (Chrome, Firefox, Internet Explorer, Opera, ...) that offer the most varied services.
In this case, the extensions we're going to describe allow an online profit extra if you install and let it work in the background.

Why do they make money online?
Many of these services have been created by statistical services that, by analyzing users' use of the various browsers, reward those who use them with real money.
Many others simply install advertising services that, from time to time, display advertising banners during our browsing.

Our advice is to read well all the conditions of use of the various services because, however, your PC will still be under control and may result in little virtuous extensions that also control passwords and sensitive data.