Disabling javascript alerts?

I use an extension called Black theme for YouTube (https://addons.mozilla.org/en-US/firefox/addon/black-youtube-theme/). Now whenever I start Firefox using the last time restore session. For open links from YouTube I have pop opens a small Application JavaScript box, one per link, which returns "error: document.domain is null. This is the only problem I have, so I was wondering if anyone knows how to disable error messages JavaScript using about: config?

Pref. of Capability.Policy are not supported in current versions of Firefox, so you can undo these steps.

If this only happens when you reopen the pages automatically the next time you start then this is probably caused by Firefox load pages from the cache.

Tags: Firefox

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