Example is made by using Video DownloadHelper, but you can use any video downloader plugin.
Download Video DownloadHelper for chrome
Download Video DownloadHelper for firefox
Then choose any public video (apart from openload player), play the video and follow these steps:
- Find a random public video, click play
- Browse the code until you find the video tag, it should look like this

- Open src URL, it should lead you to the ddl link