A JavaScript blocker like NoScript is also recommended. Many websites have integrated external Javascripts, which produce, among other things, cookies, trackers, etc. from and for third parties, especially advertisers.
However, handling Javascript blockers requires a certain level of knowledge in order to find out which scripts are relevant for the correct operation of a website.
In addition, more and more sites are making the proper functioning of their site dependent on scripts from data collectors (e.g. Google Analytics, Doubleclick).
By the way, Swisscom.ch also uses a data collector: tiqcdn.com. But Swisscom.ch also works without this data octopus.