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I get this error so often on different website, why?
Error: document.getElementById(...) is null
Error: document.getElementById(...) is null
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This issue can be caused by an extension that isn't working properly.
Start Firefox in Safe Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration is causing the problem.
- switch to the DEFAULT theme: "3-bar" menu button or Tools -> Add-ons -> Appearance
- do NOT click the "Refresh Firefox" button on the Safe Mode start window