After login to discourse forums, Tor Browser will show: Will you allow forum.domain.org to use your HTML5 canvas image data? This may be used to uniquely identify your computer. How to disable use of HTML5 canvas image data?

No, I could not reproduce on https://try.discourse.org.

Then maybe the Discourse(s) you tried is doing some fingerprinting? We aren’t by default in Discourse. Unless they’ve installed the discourse-fingerprinting plugin (or they did it manually in a theme).

Very strange. I am the admin of it and I didn’t add anything even remotely related to HTML5 canvas. (And I guess a server compromise to add HTML5 canvas is quite unlikely.) So I wouldn’t know what I did wrong. [image] zogstrip: Unless they’ve installed the discourse-fingerprinting plugin Not using any plugins (except the default docker manager plugin). [image] zogstrip: (or they did it manually in a theme). Using default theme.

Yes, I can confirm I also noticed same on the Tor browser.

On try.discourse.org or on meta.discourse.org?

[image] zogstrip: On try.discourse.org or on meta.discourse.org? Can’t reproduce on neither. [image] Gulshan_Kumar: Yes, I can confirm I also noticed same on the Tor browser. In which forum is it happening for you? In the forum where I am admin? (Don’t want to advertise it here, no need.) Or you don’t know me (good, in this case, ha) and it is happening for you in another forum? Does it happen for you in try.discourse.org or on meta.discourse.org?

How to disable use of HTML5 canvas image data?

Product Support

zogstrip (Régis HANOL) December 19, 2018, 9:35am 2

Does it show that on all Discourses? For example https://try.discourse.org?

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How to disable use of HTML5 canvas image data?

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