TBA: Window size rounding isn't used

On desktop, the window size rounding was uplifted into Firefox with bug 1330882. This is not effective on Android.

added TorBrowserTeam201901 component::applications/tor browser owner::tbb-team priority::very high severity::normal sponsor::8 status::new tbb-fingerprinting-resolution tbb-mobile tbb-parity type::defect labels

How will this bug will affect the sites UX? Specially when they are using CSS media queries.

Replying to igt0:

How will this bug will affect the sites UX? Specially when they are using CSS media queries.

I'm not sure. Currently, when I visit https://whatismybrowser.com using TBA it shows something like: Computer Screen: 412x609 Browser Window Size: 412x609 or 412x670 (depending on whether the toolbar is showing or not (Full-screen browsing)).

I suspect these screen sizes can fingerprint specific devices (but I haven't tested many other phones or tablets).

Replying to sysrqb:

I suspect these screen sizes can fingerprint specific devices (but I haven't tested many other phones or tablets).

Err, sorry, "specific device models" is what I meant.

Trac:
Cc: sysrqb, igt0 to sysrqb, igt0, arthuredelstein

Android allows us to change display size in settings. We can also set specific size in developer settings. Maybe it can be mitigated if all users are advised to set a specific display size.

Trac:
Username: towiw

Testing different display sizes in https://browserleaks.com/css shows that only min-height, device-height, and min-device-height are changed. All the rest remain unchanged. So changing display size in Android settings is not really effective.

Trac:
Username: towiw

Actually it may work. I don't have two phones to test it. Can anyone test it on two different phones and see if setting the same display size is effective?

Only phones running on 7.0 nougat and above have the ability to change display size. At least 7.0+ users can have the same fingerprint.

Trac:
Username: towiw2

Trac:
Parent: #25703 (moved) to N/A
Keywords: N/A deleted, tbb-fingerprinting-resolution added

Moving our tickets to September 2018

Trac:
Keywords: TorBrowserTeam201808 deleted, TorBrowserTeam201809 added

Moving tickets to October

Trac:
Keywords: TorBrowserTeam201809 deleted, TorBrowserTeam201810 added

Moving our tickets to November.

Trac:
Keywords: TorBrowserTeam201810 deleted, TorBrowserTeam201811 added

Moving our tickets to December.

Trac:
Keywords: TorBrowserTeam201811 deleted, TorBrowserTeam201812 added

Moving tickets to Jan 2019.

Trac:
Keywords: TorBrowserTeam201812 deleted, TorBrowserTeam201901 added

Trac:
Sponsor: N/A to Sponsor8

tbb-parity items.

Trac:
Keywords: N/A deleted, tbb-parity added

See also: #30945 (moved)

mentioned in issue #30542 (moved)

mentioned in issue #30945 (moved)

mentioned in issue #32483 (moved)

moved to tpo/applications/tor-browser#27083 (closed)