I created a small script what you can inject the code in the browsers Console.

When you’re on Facebook.com you can Inspect code and head to Console.

Copy/Past the code in the Console and press Enter

Javascript

const hideSponsored = () =>
	document.querySelectorAll('[role="feed"] [data-pagelet]').forEach(el => {
		let spEl = el.querySelector('[aria-label="Sponsored"]')
		if (spEl !== null) el.style.display = 'none'
	})

const enabledSponsorRemoverFromFeed = () => {
	let d = document,
		postFeed = d.querySelector('[role="feed"]'),
		postFeedObserver = new MutationObserver(
			mutations => mutations && hideSponsored()
		)

	postFeed &&
		postFeedObserver.observe(postFeed, {
			childList: true
		})
}

enabledSponsorRemoverFromFeed()
hideSponsored()

I might make Chrome plugin for it, unless you can make it your own.

Bookmark Javascript Inject

Name:
Facebook - Hide Sponsored Feeds

URL:

javascript:(()=>{const e=()=>document.querySelectorAll('[role="feed"] [data-pagelet]').forEach(e=>{null!==e.querySelector('[aria-label="Sponsored"]')&&(e.style.display="none")});(()=>{let l=document.querySelector('[role="feed"]'),o=new MutationObserver(l=>l&&e());l&&o.observe(l,{childList:!0})})(),e()})();