Facebook Sponsored Ad Filter - Use this w/ your preferred script injector (ex. "CJS" on Chrome or "Code Injector" on FF)

inject.js

// Updated & working as of March 24th, 2020
;(() => {
  function removeAds() {
    Array.from(document.querySelectorAll('[id^=feed_sub_title], [data-testid^=story-subtilte], [data-pagelet^=FeedUnit]'))
      .map(e => { 
        let content = e.innerText
        let dynamic = Array.from(e.querySelectorAll('span:not([data-content=""])'))
          .filter(e => e.style.display != 'none')
          .map(e => {
            let hidden = window.getComputedStyle(e, ':before').getPropertyValue('content')
            return (hidden && hidden !== 'none' ? hidden : '') + e.innerText
          })
          .join('')
          .replace(/['"]+/g, '')
        if ((content + dynamic).toLowerCase().includes('sponsored')) {
          e.closest('[data-pagelet^=FeedUnit]').remove()
        }
      })
    setTimeout(removeAds, 200) // change to whatever interval you want...
  }
  removeAds()
})();