You can indeed save from the cache. These files and directories are usually hidden, but you can see them if you set up your Windows explorer properly. (Tools/folder options, "view" tab, "show hidden files and folders".)
When you've done that, browse to your cache (location can be found in the internet explorer options, temporary internet files, settings.). Sort the files by size or extension, and copy the large ".mov" file to another location. There are usually a couple (or a lot) of directories there; and don't expect the names to make any sense.
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