TypeError: document.getElementById (myId) is null this guard popping up message - even though I closed it several times... simple help please?

When im just browsing the internet, this message keeps popping up - no matter how many times crazy I close! I do not understand what plug - ins (etc etc), so please could you answer in the easiest way possible?

If this happens on several different sites, it could be caused by an add-on which is by train (default?) to access pages or modify itself in response to the pages.

You could just disable all add-ons nonessential here and then restart Firefox and see if this is useful:

Orange Firefox button or classic menu Tools > Modules > category: Extensions

Orange Firefox button or classic menu Tools > Modules > Plugins category

Tags: Firefox

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