In a previous tip, I showed you how you can use Firefox to browse your hard drive for files and folders. This tip works great when you want to keep the number of applications open to a minimum or you are using Firefox on a portable USB Drive
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Another cool feature is the capability to view files and folders or play music and video files in Firefox simply using drag and drop.
read more: FireFox Tip: Use Drag And Drop To View Files And Play MP3 Music