[tbb-bugs] #32229 [Applications/Tor Browser]: Websites Rendered with Border Within TOR Window

[Tor Bug Tracker & Wiki]

#32229: Websites Rendered with Border Within TOR Window
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 Reporter:  TornadoGR1                |          Owner:  tbb-team
     Type:  defect                    |         Status:  closed
 Priority:  Medium                    |      Milestone:
Component:  Applications/Tor Browser  |        Version:
 Severity:  Normal                    |     Resolution:  not a bug
 Keywords:                            |  Actual Points:
Parent ID:                            |         Points:
 Reviewer:                            |        Sponsor:
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Changes (by ggus):

 * owner:  (none) => tbb-team
 * status:  new => closed
 * component:  Webpages => Applications/Tor Browser
 * resolution:   => not a bug


Comment:

 Tor Browser in its default mode is starting with a content window rounded
 to a multiple of 200px x 100px  to prevent fingerprinting the screen
 dimensions. The strategy here is to put all users in a couple of buckets
 to make it harder to single them out. That worked so far until users
 started to resize their windows (e.g. by maximizing them or going into
 fullscreen mode). Tor Browser 9 ships with a fingerprinting defense for
 those scenarios as well, which is called Letterboxing, a technique
 developed by Mozilla and presented earlier this year. It works by adding
 white margins to a browser window so that the window is as close as
 possible to the desired size while users are still in a couple of screen
 size buckets that prevent singling them out with the help of screen
 dimensions.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/32229#comment:1>
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