Recent Tor Browsers (as of writing, current stable version is 3.6.5) resize the browser window to a multiple of 200x100 pixels on opening. I understand this is to reduce the chances of a user being fingerprinted by their screen size. Unfortunately with a widescreen laptop and using a desktop environment with both top and bottom panels this results in a tiny Tor Browser window that is uncomfortable to use.

Websites like EFF's Panopticlick (https://panopticlick.eff.org) that measure screen size fail to display a measurement when JavaScript is turned off. When searching I can't seem to find any non-JavaScript method to measure a user's browser/screen size.

Is it safe to resize the Tor Browser window, as long as JavaScript is disabled globally beforehand?


1 Answer 1


CSS can also measure your window width and height and send it back to the server. See the demo here: https://arthuredelstein.github.io/tordemos/media-query-fingerprint.html

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.