While decompiling the Mainscreen.swf site, I decided to look at the scripts to see if I could find any external links or something that could've been archived as well, and to my surprise I found out the site is made up of multiple SWF files as seen here:
Each of these SWF files serve their own purpose too:
mainscreen_frame.swf: The frame of the website, determines what language you want to play in and gives you the appropraite logo, "Furby Island" being 'Engelska' and "Furbee Island" being 'Deutsch', and also has a drop down menu and icons and whatnot, along with a sound that plays for selecting things.
Bubble_Blase.swf: The clouds that shoot out when you enter the island.
mainscreen_preloader.swf: Loading screen that's supposed to show up before the island loads, basically the furby footprints, along with a PNG of a furby
pop_up_preloader: Based on the image of the Furby, I'm guessing it was basically the same preloader except the furby popped up from the bottom of the screen.
Pull_Down_Menu.swf: Basically just that, a menu that could be pulled down.
One more thing I'll mention: Looking into the script and upon trying to open the pull down menu, I discovered a URL titled furby.de.test.dev, which I'm guessing was the debug site for the developers to test each part of the page, though I'm not sure what was on it since it hadn't been archived at all.
I might look into it further some other time to see if I can somehow access other parts of the flash site, I only looked into this again since I got sidetracked while doing schoolwork, which is something I only have to do for a few more months so who knows, maybe after that I might contribute more to this place :O