http://www.videohelp.com/tools/VideoCacheView
VideoCacheView let you save downloaded video files from Web browser cache. After watching a video in a Web site, you may want to save the video file into your local disk for playing it offline in the future. If the video file is stored in your browser's cache, this utility can help you to extract the video file from the cache and save it for watching it in the future.
Version 2.37
Fixed bug: VideoCacheView crashed on some systems while reading the cache files of Firefox.
Added 'Auto Size Columns+Headers' option, which allows you to automatically resize the columns according to the row values and column headers.
Fixed issue: Dialog-boxes opened in the wrong monitor, on multi-monitors system.
Portable versions avail.