changes to navigator.plugins[] enumeration to reduce fingerprinting

Chris Peterson cpeterson at
Fri Nov 22 21:35:13 UTC 2013

On 11/22/13, 1:06 PM, joakimsen wrote:
> You mention fonts... what is being done to mitigate fingerprinting via the
> fonts list?

JavaScript does not expose installed fonts, but the Flash and Java 
plugins do. Perhaps Firefox's plugin process could intercept plugins' 
calls to the operating system's font APIs, limiting which fonts are 

There are also techniques to determine whether particular fonts are 
installed by comparing CSS text heights.

More information about the firefox-dev mailing list