Does the browser send data to the MTS server?

Question

Computer networks

The netlimiter4 program sends something to the server - it sends for 15 seconds, then silence for 3 seconds, then it downloads (not always and a little bit) and sends again. And so in a circle.

Firefox browser.

PS The speed is this, because I download the game from Steam.

Answer 1

So MTS is your provider?
Cellular operators, more than other providers, like to intercept traffic in order to add advertising.

Answer 2

Some site pushed itself into Service Workers and now that site's java script is running in your browser in the background.
usually slip pop-up windows with news and advertising.
look for how to clean the shit out of your browser.