Key words are "initial default UI size."
Like many, I've had problems with TBB spoofing the correct screen sizes to sites like browserspy.dk & panopticlick.eff.org. The https://trac.torproject.org/projects/tor/ticket/9268 - about TBB screen sizing (rounding, spoofing) says it's closed.

Mike P. commented in #9268, "This bug has drifted. I think we should open new bugs for remaining issues with the rounding code that aren't quite a mismash of ancient issues and dead code. Current related bugs that will remain open are #14098 <https://trac.torproject.org/projects/tor/ticket/14098>, #14429 <https://trac.torproject.org/projects/tor/ticket/14429>." I don't know where to add my findings.

I read through the other 2 (a lot there). Most details either don't seem to apply in my case, or described behavior isn't what I'm experiencing (exactly).

Today, D/L clean 6.0.8 (Win).  Installed clean in new folder.
Left all default settings - didn't even change NoScript settings, for screen size testing.

1st time started TBB, the *vertical* ht (total) exceeded my 22" WS monitor - went below Vista's taskbar, by about 27 - 30 px. My taskbar is "stock" - never resized it - it's ~ 3/8" high. The very top TBB's border was perfectly aligned w/ top of my monitor. Browserspy reported screen size as 1000 px W x about 9xx px H (not an even number).

To see how far TBB went below the task bar, I unchecked "keep taskbar on top of applications." Surprise, when I re-enabled that option, the TBB screen height suddenly "resized" its height to fit perfectly between top of monitor & top edge of task bar. I restarted TBB - again it went below the task bar. Disabled / re-enabled the taskbar to stay on top & again TBB's height adjusted to fit between the taskbar & top of monitor.

Then... I restarted TBB again. This time TBB's bottom border was ~ 7/16" *above* the taskbar, with top border still aligned to top of monitor. Then Browserspy reported 1000 px W by 729 "available height" (what ever that means).

1) Does anyone using Windows ever see TBB width AND height reported as even numbers - or multiples of 100? If so, what site or tool is reporting that?

2) For those seeing even H & W multiples, is your TBB usable screen area *actually* square, or is that just what TBB reports to sites? My TBB *actual* usable screen is 3" wider than tall. That's between inside of L & R borders; btwn bottom of Nav bar & top of taskbar.

3) Except for amazing coincidence, I'm guessing TBB's total height would never perfectly fill the space between monitor's top & taskbar's top edge (and expect a multiple of 100).

4) What's TBB's spoofed screen W : H ratio *supposed to be* (now)? X by X, in multiples of 100? So, square? I can't keep up w/ all the changes.


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