[tor-bugs] #16364 [Applications/Tor Browser]: Add an option to resize the browser window to the "safe default"

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#16364: Add an option to resize the browser window to the "safe default"
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 Reporter:  cypherpunks                          |          Owner:  tbb-
                                                 |  team
     Type:  defect                               |         Status:  new
 Priority:  Medium                               |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tbb-usability, tbb-fingerprinting-   |  Actual Points:
  resolution                                     |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
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Comment (by Thorin):

 The behavior is the same on Windows, and I was going to suggest this as a
 hacky workaround in the other ticket I just closed - especially if you
 only have one or two tabs open and don't want to lose them.

 There **is** at least a resize event triggered when a tab is moved between
 windows, but I'm not sure what it leaks (e.g. see the new window test
 where I build an array of changes: and detect the original pre-LB size,
 the LB border being applied, and LB: and in older TB's, the new window
 clamping is bypassed)

 STR
 - open TZP (inner should be e.g. `1000` width)
 - resize the browser width so you get `1100` width (LB stepped value)
 - open new window
 - drag TZP tab to new window
 - the resize event recalculated measurements: it should now say `1000`

 I also wonder what other events this triggers :)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/16364#comment:13>
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