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por opto el Dic. 24, 2018 · enlace permanente

you just need to add the css for the options (setings.xul) to make them working again. See the 57 addon document, somewhat hidden, I oversaw it for my addons as well:

add "<?xml-stylesheet type="text/css" href="chrome://messenger/skin/preferences/preferences.css"?>
" without the "