Installation of the Plug-In is needlessly frustrating. Firefox wants a particular version.
If I try to install the plug-in for Firefox it says "OK I'm installing and this may take a while."
Meanwhile it is not downloading anything. You need to watch something that will tell you your download rate like istat menus or the Apple activity monitor.
Go to the newest Safari and try it. At least you can see what it looks and acts like when it is actually downloading and installing the plug-in.
After it is installed it won't work untill you set Safari for 32bit in the info window. Slingbox does tell you this. Thank You Slingbox and please don't stop there.
I don't know why Slingbox can not tell you ahead of time what the prerequisites of installation are. But they don't.
Prerequisites of known success at installing the Browser Plug-in;
Newest Safari in 32 bit mode
32bit mode is in a checkbox in the info window of Safari. . . With Safari closed Control click and select "Get Info" look for checkbox.
I know this to work in Snow Leopard 10.6.5
These are just the type of geeky issues you hope to avoid using a Mac but if video streaming was that easy there would be lots of competitors.
Hope this helps