123Movies Downloader (Browser Extension) Browser extension that detects and saves videos from 123Movies and all its mirror sites as standard MP4 files — directly in your browser, no extra software required. SERP 123Movies Downloader is the only browser extension built specifically for saving videos from 123Movies and every one of its mirror sites. - Save movies and shows from any 123Movies mirror for offline viewing on flights, commutes, or anywhere without internet - Never worry about disappearing mirrors — download and keep your own local copy before the domain goes offline - Skip the techn…