Firefox has user identification method blocking enabled by default.

In nightly builds Firefox, which will form the basis for the upcoming Firefox 72 release scheduled for January 7, by default enabled protection against user tracking through hidden identification methods ("browser fingerprinting"). Protection against hidden tracking is included in the default standard mode for blocking unwanted content and is implemented through additional categories the Disconnect.me list, which includes hosts caught using scripts for hidden identification.

Hidden identification refers to storing identifiers in areas not intended for permanent information storage ("Supercookies"), as well as generating identifiers based on indirect data, such as screen resolution, a list of supported MIME types, specific parameters in headers (HTTP/2 and HTTPS), analysis of installed plugins and fonts, availability of certain Web APIs specific to graphics cards Features rendering using WebGL and Canvas, Manipulations with CSS, analyzing the peculiarities of working with mouse and keyboard.

Source: opennet.ru