How to set up FlashGot to work with Gnash in Firefox?

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http://askubuntu.com – I decided to give Gnash a try but, after replacing Adobe Flash plugin (using the Flash-Aid adddon in Firefox), the FlashGot button for getting media ('FlashGot Media') is not available anymore. Here is how it should appear: DownloadHelper, a Firefox addon similar to FlashGot, works with Gnash very well. (HowTos)