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HTML <Select> dropdowns showing double spaced in FF Quantum v57.0 64 bit

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Websites using HTML <select> type dropdown menus including some I developed myself are all showing dropdown items double spaced since installing Firefox Quantum. I have tried safe mode and altering the theme in customize but it makes no difference.

Websites using HTML <select> type dropdown menus including some I developed myself are all showing dropdown items double spaced since installing Firefox Quantum. I have tried safe mode and altering the theme in customize but it makes no difference.

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Whoops, your post duplicated. I replied here: https://support.mozilla.org/questions/1188813