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There is a security risk involved. The problem is that because legitimate services rents use of this particular Google Cloud system, googleusercontent.com, it is difficult to discern what active connections to hosts on the domain are not malicious. The Google Cloud system in question is also being used by data thieves, hackers, and corporate logistics operations just to name a few. An active connection on your idle system could indicate an intruder, or simply be part of Firefox, or the operating system updater. COMPANIES SHOULD NOT USE SERVICES FROM GOOGLE CLOUD as the same system is being used for malicious activity. Google is making insufficient effort to keep the criminals from using the system also. Recently, [https://blog.kerika.com/googleusercontent-com-can-trip-you-up-if-you-disable-third-party-cookies/ Google has started storing images] in a new domain, called googleusercontent.com. This domain is used for a variety of purposes, including cached copies of websites visited by the Google search engine, but the general purpose of this domain appears to be to store static content: i.e. content that is not expected to change.There are different servers hosting Google user content, it's looks like they are on lh[1-6].googleusercontent.com, and with different prefixes.For example, a picture in a Google Maps review will gives this URL : https://lh5.googleusercontent.com/p/AF1QipO_dHIeVRPSIqwxu3VQY7n0rh_R_6oH92NKSJzE And their prefixes will be "AF1Qip",And Google profile pictures will starts with "AOh14G" :* https://lh3.googleusercontent.com/a-/AOh14GiUjlWnt4MNgr7Wmeyb3PzXlka4E8PFEIlF27oIxIA* https://lh3.googleusercontent.com/a-/AOh14GjfjYX7SdSzS12uUNr7biejHeSNKkS1cEHRwHNiSAkWe can also note that Google Photos / Albums URLs are also starting with "AF1Qip" :* https://get.google.com/albumarchive/116817211900620900327/album/AF1QipMsEEwFLNjciBTQaRxIbn1AEyTYURdLnTU36CqT/AF1QipOX0W4N7QYJDyq449-5EVDkuQ6Nk6Dvkz1HxldI* https://photos.google.com/photo/AF1QipOX0W4N7QYJDyq449-5EVDkuQ6Nk6Dvkz1HxldIMozilla uses the Google Cloud Platform for Firefox components. It is rented server capacity. Extensions can use googleusercontent.com to host some of their data files.