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.

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

I get error message every time firefox starts: xmlNode.getElementsByTagName("id")[0].firstChild is null - 2

  • 1 پاسخ
  • 47 have this problem
  • 7 views
  • آخرین پاسخ توسّط cor-el

more options

About two weeks ago I started getting this error message every time I started up Firefox: xmlNode.getElementsByTagName("id")[0].firstChild is null - 2.

I uninstalled and reinstalled Firefox, but the error continues. Then I did a System restore to several months ago, but the error continues. It doesn't happen with any other program.

Does anyone know how to get rid of it. If it has anything to do with the registry, I'll just have to let it be and switch to a different browser.

About two weeks ago I started getting this error message every time I started up Firefox: xmlNode.getElementsByTagName("id")[0].firstChild is null - 2. I uninstalled and reinstalled Firefox, but the error continues. Then I did a System restore to several months ago, but the error continues. It doesn't happen with any other program. Does anyone know how to get rid of it. If it has anything to do with the registry, I'll just have to let it be and switch to a different browser.

Chosen solution

Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).

  • Don't make any changes on the Safe mode start window.

See Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems and Troubleshoot issues with plugins like Flash or Java to fix common Firefox problems

If it does work in Safe-mode then disable all your extensions and then try to find which is causing it by enabling one at a time until the problem reappears.

  • Use "Disable all add-ons" on the Safe mode start window to disable all extensions.
  • Close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")

See also http://kb.mozillazine.org/Standard_diagnostic_-_Firefox (Extension_issues, Profile_issues)

Read this answer in context 👍 1

All Replies (1)

more options

Chosen Solution

Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).

  • Don't make any changes on the Safe mode start window.

See Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems and Troubleshoot issues with plugins like Flash or Java to fix common Firefox problems

If it does work in Safe-mode then disable all your extensions and then try to find which is causing it by enabling one at a time until the problem reappears.

  • Use "Disable all add-ons" on the Safe mode start window to disable all extensions.
  • Close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")

See also http://kb.mozillazine.org/Standard_diagnostic_-_Firefox (Extension_issues, Profile_issues)