If you've ever clicked on "delete offline content" in your web browser and paid attention to just how much disk space gets freed up, you'll know that browsers like to save local copies of almost everything you have viewed. Not just text pages and images, but entire videos too. Which can occasionally be somewhat awkward if you check the browser cache of someone who didn't realise that this goes on!
If you know where to find your browser's cache folder, you can retrieve any videos from there. Which means that you can re-watch something without the need to either download it or remember which site you found it on. You can also save a local copy in a more permanent location, once you realise that something you stumbled upon is actually worth keeping.
Video Cache View, from the always-excellent Nir Sofer, is the tool you need for exploring your video cache. Download it from http://www.nirsoft.net/utils/video_cache_view.html to get started. It's less than 1 MB to download and is malware-free according to VirusTotal and Web of Trust.
When you run it, the program will search all your browser cache locations (assuming you use any of the well-known browsers). You can then see a list of saved videos and choose what to do with them. And if you decide that you don't actually need any of them, you can then delete them all in order to free up loads of disk space.
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