firefox/chrome/userContent.css

/* Hacker News */
@-moz-document domain("news.ycombinator.com") {
	textarea, input {
		-moz-appearance: none !important;
	}

	body,
	[bgcolor="#f6f6ef"],
	[bgcolor="#ff6600"],
	textarea,
	form[action="comment"] input {
		background-color: hsl(218deg 14% 18%) !important;
	}

	.votearrow {
		filter: contrast(0%) invert() brightness(125%) !important;
		mix-blend-mode: soft-light !important;
	}

	img[src="y18.gif"] {
		filter: grayscale(1) brightness(60%) !important;
		mix-blend-mode: soft-light !important;
		margin-right: 8px !important;
	}

	form[action="comment"] input,
	form[action="comment"] textarea {
		border-color: currentColor !important;
		outline: none !important;
	}

	[action="//hn.algolia.com/"],
	.pagetop .hnname {
		display: none !important;
	}

	.subtext, .subtext a:link, .subtext a:visited,
	.comhead a:link,
	.rank,
		form[action="comment"] input {
		color: hsl(218deg 14% 33%) !important;
	}

	a:link, a:visited,
	.pagetop a:visited,
	.toptext,
		form[action="comment"] textarea {
		color: hsl(218deg 14% 43%) !important;
	}

	.c00, .c00 a:link, .c00 a:visited { color: hsl(218deg 14% 56%) !important; }
	.c5a, .c5a a:link, .c5a a:visited { color: hsl(218deg 14% 43%) !important; }
	.c73, .c73 a:link, .c73 a:visited { color: hsl(218deg 14% 39%) !important; }
	.c82, .c82 a:link, .c82 a:visited { color: hsl(218deg 14% 37%) !important; }
	.c88, .c88 a:link, .c88 a:visited { color: hsl(218deg 14% 37%) !important; }
	.c9c, .c9c a:link, .c9c a:visited { color: hsl(218deg 14% 34%) !important; }
	.cae, .cae a:link, .cae a:visited { color: hsl(218deg 14% 31%) !important; }
	.cbe, .cbe a:link, .cbe a:visited { color: hsl(218deg 14% 28%) !important; }
	.cce, .cce a:link, .cce a:visited { color: hsl(218deg 14% 26%) !important; }
	.cdd, .cdd a:link, .cdd a:visited, .comment { color: hsl(218deg 14% 24%) !important; }
}

/* Algolia: Hacker News */
@-moz-document domain("hn.algolia.com") { 
	body,
	.SearchFilters,
	.SearchHeader_search,
	.SearchHeader .SearchInput,
	.SearchResults,
	.Pagination {
		background-color: hsl(218deg 14% 18%) !important;
	}

	.Story_title a {
		color: hsl(218deg 14% 43%) !important;
	}

	li.Pagination_item-current button {
		color: hsl(218deg 14% 46%) !important;
		border-color: hsl(218deg 14% 36%) !important;
	}

	.SearchFilters_filters label,
	.Pagination_item button {
		border-color: hsl(218deg 14% 27%) !important;
	}

	.SearchHeader .SearchIcon,
	.Footer, .Footer a,
	.SearchInput::placeholder,
	.Pagination_item button,
	.SearchHeader_settings a,
	.SearchFilters,
	.Dropdown_label,
	.Story_title .Story_link,
	.Story_meta, .Story_meta a,
	.Story_comment {
		color: hsl(218deg 14% 33%) !important;
	}

	.SearchHeader_label,
	.SearchHeader_logo,
	.PoweredBy img {
		display: none !important;
	}
}

/* Private browsing new tab */
@-moz-document url-prefix(about:privatebrowsing) {
	.logo-and-wordmark,
	.search-inner-wrapper {
		display: none !important;
	}

	.info-border {
		display: none;
	}
}