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Whoever is driven to install this "NewsGuard" extension, be aware that you are disclosing your browsing history.
For each site you visit, there will be a connection to "api.newsguardtech[.]com/check/[hostname of visited site]". The result will be cached locally for at most 30 minutes. 
I don't see this browsing history disclosure being mentioned in the extension's privacy policy -- only that it uses Google Analytics: newsguardtech.com/privacy-policy/
Google Analytics is used to gather information about when you open the extension popup panel. The gathered information include the hostname of the site loaded in the current tab -- i.e. more browsing history leakage.
So in summary, "NewsGuard" get this information:
- The sites you visit
- When you visited these sites, +- 30 minutes, or with better accuracy if you open the extension's popup panel
- You public IP address
- Your browser, OS, language (through HTTP headers)
- The sites you visit
- When you visited these sites, +- 30 minutes, or with better accuracy if you open the extension's popup panel
- You public IP address
- Your browser, OS, language (through HTTP headers)
