On several sites where I use Tor, I too often get the following popup message:
This website attempted to access image data on Canvas. Since Canvas image data can be used to discover information about your computer, blank image data was returned this time.
This is considerably intrusive and it's interrupting my work. How can I configure Tor browser to never again show this popup? Ok, it sent back blank image data - I get it. I'm happy with that. I just don't want to be reminded of it - ever.
I tried following the advice here in the accepted answer: HTML5 Canvas Image Extraction
However, that doesn't work (maybe something has changed since that version?) If I delete the permissions.sqllite file, then Tor just writes it back. Editing the file just seems to show a table definition (I wanted to change the value). If I can change this value to false, and this succeeds in removing this popup, where can I change it?
How can I get rid of this message so that it never again shows up, especially after requesting a new identity?