And just one point that I forgot to mention concerning fingerprinting of Tails 
users vs TBB users: since that addon doesn't clash with section 2.3. of the
Tor Browser Design Doc (5. No Filters) it may be possible to include it in 
TBB by default and thus solving the issue that this addon may cause with
regards to fingerprinting.
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[1] : torproject(dot)org/projects/torbrowser/design/
"As a general matter, we are also generally opposed to shipping an 
always-on Ad blocker with Tor Browser. We feel that this would damage 
our credibility in terms of demonstrating that we are providing privacy 
through a sound design alone, as well as damage the acceptance of Tor
users by sites that support themselves through advertising revenue."
-- 
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