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Error: document.getElementsByTagName("head")[0] is undefined

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ragnoro
ragnoro
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javascript crash Error: document.getElementsByTagName("head")[0] is undefined

How can ı solve this problem

javascript crash Error: document.getElementsByTagName("head")[0] is undefined How can ı solve this problem

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cor-el
cor-el
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Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).

If it does work in Safe-mode then disable all extensions and then try to find which is causing it by enabling one at a time until the problem reappears.

  • Use "Disable all add-ons" on the Safe mode start window to disable all extensions.
  • Close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")