Firefox to add Tor Browser anti-fingerprinting technique called letterboxing

A demo of the letterboxing anti-fingerprinting feature is available below, as it was first developed for the Tor Browser:
Letterboxing is currently available in Firefox Nightly and will be generally available for all users with the release of Firefox 67 in May. Image: ZDNet
Firefox’s letterboxing support doesn’t only work when resizing a browser window but also works when users are maximizing the browser window, or entering in fullscreen mode. The only thing that’s missing in Firefox’s letterboxing support is the warning that the Tor Browser shows users when users are maximizing their window.

Source: www.zdnet.com