Test your browser on its fingerprint vulnerabilities, run by the EFF.
https://coveryourtracks.eff.org/
"Browser fingerprinting” is a method of tracking web browsers by the configuration and settings information they make visible to websites, rather than traditional tracking methods such as IP addresses and unique cookies.
Browser fingerprinting is both difficult to detect and and extremely difficult to thwart."
To give you insights how #JavaScript allows to build a much more unique fingerprint, try the test with JavaScript enabled and disabled.
My current browser advice:
IronFox
https://gitlab.com/ironfox-oss/IronFox