Thanks for the suggestions.
Keepvid.com looks good, but it won't help for this application. This is a website where I click on an embedded "Watch this Video" link in a page, and a JWPlayer popup comes up and plays the flash video. The URL doesn't change, so it won't work in Keepvid.
I'll have a look at Firefox add-ons like Download Them All (I primarily use Firefox on Mac and Windows). Do you know if it will grab a popup flash app like JWPlayer?
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