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getting bombarded with errors all of a sudden!
evalInSandbox:Error: Permission denied to access property 'alert' and Error: Permission denied to access property 'alert'
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Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
- Do NOT click the Reset button on the Safe Mode start window.