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

ابحث في الدعم

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.

I get a recurring error message: "document.get Elements By Tag Name (...)[0] is undefined. the message repeats every time I try to page back. Reloading no cure

  • 2 (ردّان اثنان)
  • 3 have this problem
  • 7 views
  • آخر ردّ كتبه cor-el

kenperkins
kenperkins
more options

The above error message appears and until I click on it an make it go away, I can do nothing. I get into a mode where the message appears every time I click on page back and have to close the internet connection. Happens only in Firefox. I have reloaded Firefox and it goes away for twenty or thirty minutes, but returns.

The above error message appears and until I click on it an make it go away, I can do nothing. I get into a mode where the message appears every time I click on page back and have to close the internet connection. Happens only in Firefox. I have reloaded Firefox and it goes away for twenty or thirty minutes, but returns.

All Replies (2)

philipp
philipp
  • Moderator
more options

hello, please try to reset firefox and see if this can address the issue...

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

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).

  • Do NOT click the Reset button on the Safe Mode start window or otherwise make changes.

Which security software (firewall, anti-virus) do you have?

Boot the computer in Windows Safe mode with network support (press F8 on the boot screen) as a test to see if that helps.