Mention how per-site exceptions affect Firefox's Total Cookie Protection

[Hank]

@any1

Just to clarify your point: it does not globally disable Total Cookie Protection. It only affects the sites you add as exceptions.

This doesn’t change much, since the most important sites for me are in exceptions and they’re not protected.

If sites like YouTube are exceptions, then on every site with embedded video these YouTube cookies will be without isolation. These cookies are not cleared on exit either because the domain is in exceptions, so they can be reused later.
This feature seems completely broken when exceptions are used.