[4] They use it for features such as allowing cookie registration, detecting domain names in the address bar and site grouping.
Security issues like a same-site attack can arise if the Public Suffix List is incorrect, or if browsers or sites are not properly configured.
[9][10] Some uses for the list are:[11] The PSL has been seen as a tool for a variety of goals related to security, privacy, usability and resource management which can be in tension with each other, leading to maintenance difficulties and operational challenges.
[12][13][14] Ideas for effective approaches such as dbound, HTTP State Tokens and First Party Sets have been explored without consensus yet on good alternatives.
[15] In 2021, privacy enhancements in iOS 14.5 related to Apple's Identifier for Advertisers and unclear guidance from Facebook led to a flood of inappropriate requests for domains to be added to the Public Suffix List.