zotero/chrome/content/zotero-platform/unix/overlay.css

/* Fixes tabs missing styling on (GTK 3.20) Ubuntu 16.10. See https://bugzilla.mozilla.org/show_bug.cgi?id=1306425 */
tabpanels {
	-moz-appearance: none;
	border: 1px solid hsla(0, 0%, 0%, 0.2);
	
}
tab {
	-moz-appearance: none;
	border-top: 1px solid hsla(0, 0%, 0%, 0.2);
	border-right: 1px solid hsla(0, 0%, 0%, 0.2);
	border-left: 1px solid hsla(0, 0%, 0%, 0.2);
}
/* Fixes misc Ubuntu 16.10 rendering issue fixes. */
#zotero-prefs menulist dropmarker{
	width: 30px;
}
#zotero-prefs .numberbox-input-box{
	-moz-appearance: textfield;
}

#zotero-tags-splitter:not([state=collapsed]) {
	min-height: 5px;
}

#zotero-context-splitter-stacked {
	-moz-appearance: none;
	background-color: #ececec;
	border-top: 1px solid hsla(0, 0%, 0%, 0.2);
}