On Fri, Nov 3, 2017 at 12:06 PM Tom Ritter tom@ritter.vg wrote:
Wordpress would like to detect Tor Browser so it doesn't perform the
check and therefore doesn't pop the prompt. This would significantly reduce the number of prompts Tor Browser users are seeing.
I think a possibly good way to avoid the prompt might be a method Tom and Mark suggested before: block image extraction without showing the prompt unless the extraction attempt happens following a user interaction:
https://bugzilla.mozilla.org/show_bug.cgi?id=1376865
And indeed this would provide scripts a way of silently checking for canvas fingerprinting protection. On load, draw on a canvas and attempt to extract: if the returned image is blank, the page knows not to do it again after a user interaction.