Image Data On A Canvas

I installed Tor yesterday and as i was getting things set up it flagged one of my applications thus "Attempted To Access Image Data On A Canvas" Stating that it was trying to glean information from my machine.. On a secret squirrel meter how serious is this 1-10.. this is a first for me

Tia..
Hogndog

 

The HTML5 canvas element functionality can be used to try to fingerprint your machine (http://cseweb.ucsd.edu/~hovav/dist/canvas.pdf) and/or track you via assigned identifiers embedded within images. It can be used for legitimate purposes as well. I think I read that TOR browser protections include an alert on an attempt to read data and the read returning phoney data. You'd have to dig into the webpage code to determine whether an alert corresponds to a legitimate or malicious attempt.

 

Thank you.. now I've some work to do in order to decide where this will lead, to the right or to the left..

Thanks..
Hogndog