Lucky - http://www.chrisfinke.com/addons/tubestop/

something about this guys Firefox extension blocks you tube overlay adds. Maybe some digging and we can find out how.

Grease Monkey script - I don't know much about grease monkey so I'm not sure how much use this will be.
http://userscripts.org/scripts/show/13333

see this code ( search for this code in the source file I linked above) Im pretty sure the rest is in there.
Greasemonkey is about a week old for me So I have know Idea what its doing, here.

// Removes the video annotations (depends on the Main Reload)
if (removeAnnotations) {
deleteFlashVar("iv_storage_server", false);
deleteFlashVar("iv_module", false);
}

// Removes the video captions (depends on the Main Reload)
if (removeCaptions) {
deleteFlashVar("ttsurl", false);
deleteFlashVar("subtitle_module", false);
}

Can someone link me a video that definitely has one?
(haven't seen one yet)

Thanks for the info about TubeStop, Nordlich. I just installed it. For this you have just earned one promote from me, because I can't stand those motherfucking ads.

ty

>> ^NordlichReiter
I don't know much about grease monkey so I'm not sure how much use this will be...

Have you ever tried holding on to a greasy monkey? There's your explanation why the ads wont stick...

Thanks for the tip!

Adblock plus along with 'Adblock Plus: Element Hiding Helper' does the trick for me.

Adblock plus: https://addons.mozilla.org/en-US/firefox/addon/1865
Element Hiding Helper: https://addons.mozilla.org/en-US/firefox/addon/4364

Or maybe just adblock plus because I haven't seen an ad yet.

^ yeah, you're probably right.

Comment hidden because you are ignoring dag. (show it anyway)

I can't see them, even when I'm logged into the US VPN.

You know, come to think of it my work computer (where I saw the ads) hasn't been blocking all ads lately, so that might just be my problem. (Or one of them at least.)

I was playing with that monkey script thing, and ..I think it even lets you toggle the adds on and off.

greasemonkey allows users to inject their own javascript into a page as it's rendered. The fact that the ads can be disabled with javascript means it's theoretically feasible to include javascript in videosift's code that disables the ads on all embeds.