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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.There is a security risk involved. The problem is that legitimate organizations as well as scammers rent 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 has historically been 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. Two examples of legitimate organizations also using googleusercontent.com for various purposes:* Canonical aka Ubuntu Linux* Mozilla Firefoxbc.googleusercontent.comThe bc host originates from Google Compute Engine (Google cloud) that does not have to be from Google itself. It is a service anyone can use. Various commercial entities, organizations, and private individuals pay to use this service from Google.bc originates from Google Compute Engine (Google cloud) That does not have to be from Google itself. It is a service anyone can use.Google claims that Google activity by Google is excluded from googleusercontent.com which is isolated for 3rd party use. However, there is plenty of evidence that Google itself conducts activity on googleusercontent.com. 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. 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. You also need to take into account the 1st bit of that: bc.googleusercontent.com bc originates from Google Compute Engine (Google cloud) That does not have to be from Google itself. It is a service anyone can use. lh3.googleusercontent.com Used for loading images for Google+.* lh3.googleusercontent.com Used for loading images for Google+. lh5.googleusercontent.com Used for loading images for Google+.* lh5.googleusercontent.com Used for loading images for Google+. lh6.googleusercontent.com Used for loading images for Google+.* lh6.googleusercontent.com Used for loading images for Google+. s3.googleusercontent.com Used for loading favicons for AdWords ads.* s3.googleusercontent.com Used for loading favicons for AdWords ads. static.googleusercontent.com* static.googleusercontent.com themes.googleusercontent.com Used for loading font files for Google Fonts. (Generally called within CSS from fonts.googleapis.com)* themes.googleusercontent.com Used for loading font files for Google Fonts. (Generally called within CSS from fonts.googleapis.com) translate.googleusercontent.com Google Translation Service* translate.googleusercontent.com Google Translation Service Some references: