[tor-bugs] #7265 [Firefox Patch Issues]: Canvas extraction message should provide path to full url

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#7265: Canvas extraction message should provide path to full url
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 Reporter:  mikeperry                       |          Owner:  mikeperry
     Type:  enhancement                     |         Status:  new      
 Priority:  major                           |      Milestone:           
Component:  Firefox Patch Issues            |        Version:           
 Keywords:  tbb-fingerprinting, tbb-bounty  |         Parent:           
   Points:                                  |   Actualpoints:           
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 In #6253, we created a prompt before allowing sites to extract image data
 from the HTML5 canvas. We did this for fingerprinting reasons.

 However, since deploying that patch, I have noticed the warning on at
 least two random sites.

 Unfortunately, the warning is not reproducible, and likely came from a
 particular 3rd party advertising network. Extra unfortunately, we display
 only the first party URL in the warning, for usability reasons and for
 first party-jailed content permissions.

 We should provide some mouseover tooltip or other way of determining the
 full third party url in such warning boxes.

 We need to be careful that such a notification does not clutter the
 warning box or confuse users, and we also need to be mindful of string
 updates, since the strings are stored in Torbutton but are used in Tor
 Browser (for translation expedience).

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/7265>
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