Opened 6 years ago

Last modified 3 years ago

#13445 new enhancement

Adjust TBB window size

Reported by: cypherpunks Owned by: tbb-team
Priority: Medium Milestone:
Component: Applications/Tor Browser Version:
Severity: Normal Keywords:
Cc: gacar, gk Actual Points:
Parent ID: Points:
Reviewer: Sponsor:


It is reasonable to increase the default width of TBB windows to 1200 or 1400. Most displays nowadays are widescreen, so are most web pages.

Child Tickets

Change History (4)

comment:1 Changed 6 years ago by gk

Cc: gacar gk added

You mean, not restricting the max width to 1000 anymore? gacar: Do you have, by chance, some data to back this up and some quick calculations whether this is worse (wrt anonymity groups) than the current solution? :)

comment:2 Changed 6 years ago by gacar

According to very simplistic calculations, it'd be slightly worse than the existing case:

Without any resizing, entropy of the screen resolution distribution: 5.61 bits, # of bins: 27471, # of data points: 2,996,391.

With different resizing parameters:
TBB max width, Entropy (bits), # of bins (anon. sets), Screen utilization (TBB area/screen area)
1000px: 2.79 bits, 87 bins, %57.87 (current countermeasure)
1200px: 3.12 bits, 108 bins, %63.96
1400px: 3.23 bits, 133 bins, %67.15

Also to note, the biggest anon. set for the max_w = 1400px case is 1400x900. This means, a lot people with 1400+ horizontal resolution would benefit from this change, without being easily identifiable.

5 Largest anonymity sets for max_w = 1400
1400x900, 710369
1200x600, 698672
1400x700, 397267
1200x800, 351765
1400x1000, 300197

5 Largest anonymity sets for max_w = 1000
1000x600, 902896
1000x900, 711738
1000x700, 443070
1000x800, 381586
1000x1000, 314155

But let me take a few days more to plot the anonymity set distributions with respect to different resizing parameters, as the overall entropy doesn't tell much about the details of the distribution.

comment:3 Changed 6 years ago by cypherpunks


comment:4 Changed 3 years ago by teor

Severity: Normal

Set all open tickets without a severity to "Normal"

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