The pseudo website attempts to access canvas image data

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Using Tor ( the Anonymising browser to access a website yesterday brought about a surprise message:

This Website ( attempted to access image data on a canvas. Since canvas image data can be used to discover information about your computer, blank image data was returned this time.

Then a drop down menu offered me the option to “Allow in the Future or “Never for this site”, which I of course selected. I took a screenshot to share here:

Screen Shot 2014-01-22 at 12.00.07

Why would this happen?

When I googled “canvas image data” I got this article pop up which talks about facing similar problem.

They are investigating the issue.

Will the owners and admins of the pseudo wikileaks forum do the same and explain why their website attempts to access canvas image data?