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Bug 40035: Added a fonts fingerprinting test

Added a test to check that fingerprinting can only detect the fonts we bundle with Tor Browser. The code is readapted from TorZilla Print:

The list should be updated to match the bundled fonts. Also, we ship different fonts in different platforms, so the test is enabled only for Linux.

Added also a test to detect which glyph the browser can render and their size. The code was originally developed by David Fifield and Serge Egelman:

The expected result of the test comes directly from a run on Tor Browser, and we want it to be persistent, rather than having some deisred metrics to match.

Fixes #40035 (closed).

Edited by Pier Angelo Vendrame

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