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
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.
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hello, please try to reset firefox and see if this can address the issue...
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.
- https://support.mozilla.org/kb/Safe+Mode
- https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
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.