This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

This thread was archived. Please ask a new question if you need help.

How can Firefox be setting the TZ environment variable?

  • 3 replies
  • 2 have this problem
  • 1 view
  • Last reply by DAVe3283

DAVe3283
DAVe3283
more options

Time in websites is off compared to my local clock. If I run Date() in the console, I get "Tue Oct 24 2017 04:33:59 GMT+0000 (UTC)". This is incorrect, because my timezone is UTC-0700.

Using Process Explorer (or similar), I note the TZ environment variable is set to "UTC". This explains it! Right? No, because NO OTHER PROGRAM has that variable set. And it appears Firefox doesn't inherit that variable from anything. On powershell, running "(Get-Process firefox).StartInfo.EnvironmentVariables" shows that TZ is not set when Firefox is launched. So it acquired the variable after launch, which implies it set the variable itself.

How can Firefox be setting the TZ environment variable, and how do I prevent it? Ideally, I don't want to rebuild my profile.

Time in websites is off compared to my local clock. If I run Date() in the console, I get "Tue Oct 24 2017 04:33:59 GMT+0000 (UTC)". This is incorrect, because my timezone is UTC-0700. Using Process Explorer (or similar), I note the TZ environment variable is set to "UTC". This explains it! Right? No, because NO OTHER PROGRAM has that variable set. And it appears Firefox doesn't inherit that variable from anything. On powershell, running "(Get-Process firefox).StartInfo.EnvironmentVariables" shows that TZ is not set when Firefox is launched. So it acquired the variable after launch, which implies it set the variable itself. How can Firefox be setting the TZ environment variable, and how do I prevent it? Ideally, I don't want to rebuild my profile.

Chosen solution

You can also check this pref on the about:config page.

  • privacy.resistFingerprinting
Read this answer in context 👍 1

All Replies (3)

cor-el
cor-el
  • Moderator
  • Top 10 Contributor
more options

Anything useful in the source code?

cor-el
cor-el
  • Moderator
  • Top 10 Contributor
more options

Chosen Solution

You can also check this pref on the about:config page.

  • privacy.resistFingerprinting
DAVe3283
DAVe3283 Question owner
more options

cor-el said

You can also check this pref on the about:config page.
  • privacy.resistFingerprinting

Hmm, I might have set this thinking back on it. I will check when I get home from work.

I also looked at the source code file you linked, but that doesn't appear to deal with the environment variable. I think you are on to something with the resistFingerprinting setting, thanks!