allow on one site, but not another?

[scriptaculous]

Is it possible to allow a domain to run scripts, but only on their own domain?

I'm thinking of facebook. When I'm on facebook, I need it, but otherwise, I don't need them tracking my browsing. I already expanded the full addresses, but in both cases, it appears to call the top level domain. I see no differentiation.

If a domain's permissions are automatically given globally (for all websites), then I'll have to manually revoke permissions each time I leave fb.

[therube]

Have option to have domains only allowed if on that domain.