Windows 10 reached EOS (end of support) on October 14, 2025. For more information, see this article.

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.

കൂടുതലറിയുക

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

ADVISE: Add tab name or domain URL to error messages! "Error: document.domain is null"

Hirnsausen
Hirnsausen
more options

I have many tabs open in Firefox (and those tabs inside many groups because I use the TabGroup Manager addon). But when starting Firefox with the existing tabs, i get several message windows with the message:

JavaScript Application "Error: document.domain is null"

Having so many tabs in use, I simply don't know from which website URL or tab this error comes. I strongly advise that always the URL of the error-causing website, or the tab name should be added to error messages, or even the error-containing tabs should be highlighted or auto-focus or blink.

I have many tabs open in Firefox (and those tabs inside many groups because I use the TabGroup Manager addon). But when starting Firefox with the existing tabs, i get several message windows with the message: JavaScript Application "Error: document.domain is null" Having so many tabs in use, I simply don't know from which website URL or tab this error comes. I strongly advise that always the URL of the error-causing website, or the tab name should be added to error messages, or even the error-containing tabs should be highlighted or auto-focus or blink.

എല്ലാ മറുപടികളും (1)

jscher2000 - Support Volunteer
jscher2000 - Support Volunteer
  • Top 10 Contributor
more options

I'm not sure why those come up as alert dialogs, unless it is in a script or add-on to alert you to that particular error.

If you check Firefox's Browser Console (Ctrl+Shift+j or "3-bar" menu button > Developer > Browser Console) and look for those errors the source page or file should be indicated on the right side.