[tbb-bugs] #20260 [Applications/Tor Browser]: Add mitigating action to window size warning

[Tor Bug Tracker & Wiki]

#20260: Add mitigating action to window size warning
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 Reporter:  lunar                                |          Owner:  tbb-
                                                 |  team
     Type:  enhancement                          |         Status:  new
 Priority:  Medium                               |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tbb-usability, tbb-torbutton, tbb-   |  Actual Points:
  fingerprinting-resolution                      |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
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Comment (by huertanix):

 I should point out that in training journalists and others in using Tor
 Browser, almost none notice the current warning when they resize or
 maximize their window.

 Since browser fingerprinting, as far as I know with my admittedly dusty
 JavaScript knowledge, can happen the moment a browser is resized,
 something more in-your-face might be more appropriate; e.g. a JS prompt
 that intercepts the window resize action and prompts the user to either
 click OK and resize or Cancel and not resize, with a short warning on why
 resizing can be unsafe.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20260#comment:6>
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