All articles I have read so far AND the maker's site all refer to this item as an addon or plugin for Firefox. However, it is not in Mozilla's list and it seems to want to download itself and be installed like its own program. I am now unsure about using it. If you search around for it's name or "Core Online" games, you will read about how 3D games can now run within a browser without having to make a new version of the game. Google's Chrome browser does this with no addons needed, (it uses something called Native Client, which I guess comes automatically within Chrome). Everyone says that Firefox needs one plugin (a "small piece of code" that allows 3D graphic to run in Firefox, says the articles). I wanted to try this feature, but ONLY because I'm more comfortable adding this supposedly "small code" plugin than installing a video game. (PC video games alter OS settings, causing computer problems down the road - or so computer people tell me. So each video game installed alters your system a little and after awhile the conflicting directions mess up Windows.) But why would this "plugin" not actually be a plugin on Mozilla's list? I really am not comfortable with installing various programs on my PC, (trying to keep it simple and clean). Would installing Chrome be less invasive? Is there some way to get Mozilla's opinion about this "addon" instead of having to trust everyone EXCEPT Mozilla's opinion? How is a person supposed to know whether to trust a program that claims it will alter Firefox, but doesn't use Mozilla's "plugins" page? Any help or opinions appreciated.