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Back in the day, Firefox experimented with making third-party cookies session-only, but I believe this option was disabled because some websites using third-party login cookies required users to login every session.

Have you run into any problem websites with self-destructing cookies?

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Disabling 3rd party cookies has never broken a single site for me. I've heard that some banks require them, though. As for Self-Destructing Cookies: it's a pretty drastic measure. Considering this, it's surprisingly compatible. Among the sites that I frequent, not a single one stopped working. Inter-domain transaction - e.g. a shop forwarding you to Paypal and back - used to be a problem, but the latest version has a heuristic for that. Still, I'm pretty sure that some people will experience fallout. You can work around that; SDC has numerous functions that can help in such cases (pause, undelete, whitelist for session).

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