Evaluate web fingerprint

Now that we use Torbrowser patches (#5798 (closed)), we can reconsider the browser fingerprinting issue.

We should evaluate the Tails web browser fingerprint.

Extensions: FoxyProxy, Cookie Monster, You tube video downloader, download manager (not implemented yet), Adblock.
Would we be ready to stick to or synchronize our add-ons with Torbrowser? (e.g Adblock is useful)
"Tor Browser disabling Javascript anonymity set reduction" thread on tor-talk

team: jvoisin, spriver?

Original created by @tails on 5362 (Redmine)

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