Firefox has a great number of configurable options when it comes to privacy. I first discovered this as I was browsing privacytools.io recommendations. Mozilla also has a privacy task force documenting some these options. I later learned that there is a website called Firefox Profilemaker that takes the user step by step creating a privacy preserving profile.
Here are the list of settings in
about:config that I found most interesting,
|privacy.resistFingerprinting||Attempts to resist fingerprinting.|
|privacy.firstparty.isolate||Isolates cookies to the first party domain to prevent tracking across domains.|
|network.IDN_show_punycode||Render internationalized domain name (IDN) as Punycode equivalent to help against phishing attacks.|
Hold Integrity released a tool to check IDNs and see if there are any look alikes domains registered on the Internet.