1411719 - privacy.resistFingerprinting leaking system time and date information

Status: RESOLVED DUPLICATE of bug 1409973

(Core :: DOM: Security, defect)

Description

[jume]

Attachment: The information that appears when setting privacy.resistsFingerpriting to "true"

User Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:52.0) Gecko/20100101 Firefox/52.0
Build ID: 20100101

Steps to reproduce:

Go to about:config
Set "privacy.resistFingerprinting" to true
Check https://browserleaks.com/javascript


Actual results:

In the website BrowserLeaks there are 3 different javascripts for Date/Time. Only 2 are hiding the actual system time and date while "toLocaleString" shows the actual time of the system.

In the console the output for "Date().toLocaleString()" is the time set by the preference, GMT +0000 but when you do "new Date().toLocaleString()" it will show your system time and date.

This doesn't seem to affect the Nightly version for Android. I tried on my phone and it works properly.


Expected results:

Should set toLocaleString to GMT +0000

Comment 1

[Daniel Veditz [:dveditz]]

Tom: I think I saw you or gk file this one already? If not here ya go.