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"Type Error: ToolbarControl.getSettingByType is not a function box keeps appearing!

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A box keeps popping up with the above error. Trying to click out of it brings up another window with the same message, this time with a box one can check stating 'Prevent this page from creating additional dialogs.'

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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 (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 or otherwise make changes.