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?
AI-generated summary
The discussion revolves around disabling the use of HTML5 canvas image data on Discourse forums. adrelanos noticed that after logging in, Tor Browser prompts a warning about using HTML5 canvas image data. zogstrip asked if this occurs on all Discourses, to which adrelanos replied that it was not reproducible on https://try.discourse.org.
zogstrip suspected that the issue might be due to the discourse-fingerprinting plugin or a manual theme modification. However, adrelanos, the admin of the affected forum, confirmed that no such plugin was installed, and the default theme was being used.
Gulshan_Kumar also reported experiencing the issue on Tor Browser, but adrelanos asked for clarification on which forum this was occurring, as the issue was not reproducible on try.discourse.org or meta.discourse.org.
Does it show that on all Discourses? For example https://try.discourse.org?
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.
Not using any plugins (except the default docker manager plugin).
Using default theme.
Yes, I can confirm I also noticed same on the Tor browser.
On try.discourse.org or on meta.discourse.org?
Can’t reproduce on neither.
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?