Opened 9 months ago

Last modified 9 months ago

#30113 needs_information defect

Tor Browser English and Tor Browser X(lang other) is fingerprintable!

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


Check this on:
Tor Browser Linux English
Tor Browser Mac English
Tor Browser Windows (YOur Lang)

Completely different result!!

Child Tickets

Attachments (1)

German.png (31.0 KB) - added by Thorin 9 months ago.
german release showing default en-US

Download all attachments as: .zip

Change History (6)

comment:1 Changed 9 months ago by gk

Priority: ImmediateMedium
Severity: CriticalNormal
Status: newneeds_information

What do you mean with "Completely different results!!" It's known that Tor Browser across platforms is not as good as it should at hiding that fact. Search for tickets with tbb-fingerprinting-os for what we already have on our radar. Is there more you are missing?

comment:2 Changed 9 months ago by Thorin

I downloaded the latest German stable 64bit for Windows

checking default prefs I see

  • intl.locale.requested - de
  • intl.accept_languages - en-US
  • javascript.use_us_english_local - true
  • intl.regional_prefs.use_os_locales - false

Under options>general>language ... there are only two items (in this order)

  • English/Vereinigte Staate von Amerkia [en-US]
  • Englisch [en]

All these look good to me (except not sure about intl.locale.requested - I always have mine set as en-US, but then English is MY language, and I'm not sure where/how exactly requested languages get picked up on: but it's a usability issue: not everyone speaks English)

Results on fpjs2 are "en-US"
Results on are

  • languages: en-US,en and all the rest are en-US

Cannot replicate

Last edited 9 months ago by Thorin (previous) (diff)

Changed 9 months ago by Thorin

Attachment: German.png added

german release showing default en-US

comment:3 Changed 9 months ago by cypherpunks

Completely different result also with Tor Browser Android English

comment:4 Changed 9 months ago by Thorin

Just to add to my attempt to replicate the issue: while English is my system language / format / locale , it is not English (United States)

comment:5 in reply to:  description Changed 9 months ago by Thorin

Replying to cypherpunks:

Tor Browser Windows (YOur Lang)

Can you go to about:support and paste your Important Modified Preferences

Replying to gk:

... Search for tickets with tbb-fingerprinting-os ...

It's the language not the OS that is apparently leaking

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