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Cannot view embedded code?

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When viewing embedded code on websites such as Stack Overflow, the code will appear briefly for a second and then will change to "[object Object]," on repeat. How can I view code in my Firefox browser?

When viewing embedded code on websites such as Stack Overflow, the code will appear briefly for a second and then will change to "[object Object]," on repeat. How can I view code in my Firefox browser?
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Could be a problem with an extension.

Start Firefox in Troubleshoot Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration or if userChrome.css/userContent.css is causing the problem.

  • switch to the Default System theme: "3-bar" menu button or Tools -> Add-ons -> Themes
  • do NOT click the "Refresh Firefox" button on the Troubleshoot Mode start window