I've had the opposite problem. YouTube loads just fine in Firefox with adblockers and scriptblockers and flashblockers running and YouTube whitelisted... but I've had troubles with Vimeo embeds and whatever Daily Show/Colbert Report use for the playback software.
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"You know how parents tell you everything's going to fine, but you know they're lying to make you feel better? Everything's going to be fine." - The Doctor
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"You know how parents tell you everything's going to fine, but you know they're lying to make you feel better? Everything's going to be fine." - The Doctor