Test your browser to see how well you are protected from tracking and fingerprinting
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https://coveryourtracks.eff.org/Formerly PrivacyTools ("Encryption and tools to protect against global mass surveillance")
See https://www.privacyguides.org/en/about/privacytools/
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https://www.privacyguides.org/A fairly comprehensive list of things to be aware of and of things you can do to improve the security and privacy of your various devices.
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https://defensivecomputingchecklist.com/