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Re: [tor-bugs] #7256 [Firefox Patch Issues]: Explore zoom-based alternatives to fixed window sizes
#7256: Explore zoom-based alternatives to fixed window sizes
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Reporter: mikeperry | Owner: mikeperry
Type: project | Status: new
Priority: normal | Milestone:
Component: Firefox Patch | Version:
Issues | Keywords: tbb-fingerprinting tbb-
Resolution: | bounty
Actual Points: | Parent ID:
Points: |
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Comment (by joebt):
Now using TBB 3.5.2 (Windows).
I see "odd" (unique) screen sizes reported / detected on browser test
sites, in TWO scenarios.
1) When Windows system DPI is set = default 96 DPI.
2) When system DPI is NOT the default value (many users must set it
larger, to be able to read screens. Ex.: both Windows' & apps' Help
screens, or text in browser screens (TBB).
On browserspy.dk or others, with '''Windows' DPI = 96''', AND the TBB UI
maximized (full screen), test sites don't show "common" screen (monitor)
size. They show something like 1920 x 927 - a very "odd" value.
At same exact time, regular Fx shows "screen size" = '''1920 x 1080''' x
24.
If Windows' DPI is set > 96 (~ 100 - 110 DPI), screen size detected by
test sites is very odd. Then, with TBB UI maximized, test sites show
something like 1647 x 661 x 24. An extremely UNIQUE value.
TBB doesn't seem to report a believable, "common" screen size in either
scenario: when Windows' is set to default 96 DPI, or when it's set >
default (say, 105 DPI), as millions of users must do, in order to read the
screen - whether in a browser, other apps, help screens, etc.
Comment #2 at https://tor.stackexchange.com/questions/1619/fingerprint-
effect-of-changing-tbb-default-font-size, '''"gacar's"''' comment
indicates this whole issue may be more complicated than many realize;
especially sites using "advanced" scripts to gather data (see link to
"fpdetective" software, in the Stackexchange post).
I'd imagine, that under all these quite common scenarios, a consistent,
common screen size should be reported.
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/7256#comment:10>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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