Hide sponsored stuff on FB

fb-hide-ads.css

/* Distracting top tabs */
a[aria-label="Watch"], a[aria-label="Marketplace"], a[aria-label="Groups"], a[aria-label="Gaming"] {
    /* Make invisible */
	opacity: 0;
}

/* Distracting top tabs on hover (mouseover) */
a[aria-label="Watch"]:hover, a[aria-label="Marketplace"]:hover, a[aria-label="Groups"]:hover, a[aria-label="Gaming"]:hover {
    /* Slightly visible on hover */
	opacity: .5;
}

/* Ads from right sidebar */
[data-pagelet="RightRail"] > :first-child > :first-child,
/* sm-hide class */
.sm-hide {
    /* Make invisible */
    opacity: 0;
}

fb-hide-ads.js

function addClassToSponsoredStuff() {
    // Find all sposored labels
    document.querySelectorAll( '[aria-label="Sponsored"]' ).forEach( e => {
    	// Find article, start with parent
    	let article = e.parentNode;
    	// Check parents until the article is found
    	while ( article.role !== 'article' )
    		article = article.parentNode;
    	// Add sm-hide class to sponsored articles
    	article.classList.add( 'sm-hide' );
    } )
}

// Do addClassToSponsoredStuff every second (for dynamic content)
setInterval( addClassToSponsoredStuff, 1000 );