Created attachment 8845555 [details] Font results after upgrading to FF52 User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:52.0) Gecko/20100101 Firefox/52.0 Build ID: 20170303012758 Steps to reproduce: I checked for font fingerprinting via EFF's Panopticlick (https://panopticlick.eff.org/), first using FF51, then upgrading to FF52. I am on Ubuntu 64 bit 16.04. Actual results: The results are the same for me before and after: many, many fonts listed contributing to a unique fingerprint. Same results with a fresh profile. Expected results: I expected the results to be a very short list of fonts, similar to the results obtained for a Tor browser. Others report that after upgrading to FF52, the list of fonts is very restricted, but that is not the case for me.
I just tried the same thing in a Private Browsing window, and I get a very short list of fonts there.
bug 1336208, or in http://www.ghacks.net/2016/12/28/firefox-52-better-font-fingerprinting-protection/: You need to do the following to use a system font whitelist in Firefox: ...
Status: UNCONFIRMED → RESOLVED
Last Resolved: 2 years ago
Component: Untriaged → Security
Resolution: --- → DUPLICATE
Duplicate of bug: 1336208
Did the following: Type about:config in the browser's address bar and hit the Enter-key afterwards. Confirm that you will be careful if the warning prompt is displayed. Right-click in the main pane listing all preferences, and select New > String from the context menu. Name the new parameter font.system.whitelist. Now add fonts to the whitelist separated by comma: Helvetica, Courier, Verdana is a valid value for instance. But instead of Helvetica, etc, I entered Wingdings 2, Wingdings 3, which is the same result I get with Tor browser. I checked on Panopticlick again, no change. I cleared cookies for the eff site as well. No change. The instructions in your link have no effect for me.
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