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White Bar top of screen "Not Responding"

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Just upgraded to 63.0.3 on PC running Windows 10 64 Bit Build 1803. Everytime I load FF or change to a different webpage a white bar appears at the top of the page for about 3 seconds that says "Not Responding" Did the usual Virus/Malware scan with negative results.

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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 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

It is possible that your firewall or other security software blocks or restricts Firefox without informing you, possibly after detecting changes (update) to the Firefox application. Remove all rules for Firefox from the permissions list in the firewall and let your firewall ask again for permission to get full, unrestricted, access for Firefox and the plugin-container process and the updater process. See: