Youtube doesn't work on https: in Firefox 20

YouTube stop working via https after I updated from Firefox 19.0.2 to 20.0.1. But via http it works fine. Also embedded YouTube doesn't work on sites that use src=https:// and works on that use src=http:// ones. Everything working fine as I roll back to 19.0.2 and stop working after re-update.
I've tested the Safe Mode — the same effect, doesn't help.
I've tested new profile — everything seems fine, YT works via http and https.
So, if there's no clear solution to my problem, is there any way to dump full 'about:config'-config to diff with default one?

hello reiser, this issue is likely caused by the following configuration you've performed in about:config: ''security.mixed_content.block_active_content: True'' & ''security.mixed_content.block_display_content: True''.

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