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Marks in checkboxes invisible

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On web pages that have checkboxes, I can't see checkmarks in the boxes, even after I've checked them.

When I click inside the checkboxes, the white checkmark is visible for as long as I hold down the mouse key. As soon as I let it go, the checkmark becomes invisible and the checkbox looks exactly the same way it looked before I checked it.

On web pages that have checkboxes, I can't see checkmarks in the boxes, even after I've checked them. When I click inside the checkboxes, the white checkmark is visible for as long as I hold down the mouse key. As soon as I let it go, the checkmark becomes invisible and the checkbox looks exactly the same way it looked before I checked it.

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Make sure you use a GTK 3 theme in your Linux distribution. Such issues can happen if a GTK 2 theme is used.

If you use a custom theme in Firefox and not a builtin theme then try one of the builtin themes. "3-bar" menu button or Tools -> Add-ons -> Appearance