Youtube is actually more complex than most people give it credit for.
There's an .swf file from
www.youtube.com that calls up subrequests to another .swf on s.ytimg.com as well as javascript files, which calls up more crap from s.ytimg.com, but finally the actual video file is streamed from v[1-30].cache.googlevideo.com . There's plenty of room for false positives in adblocking, whether via a direct blocker (adblock plus) or via styesheets (stylish) and hosts files. Luckily even using the filter "*googlevideo*" in adblock plus will not affect youtube videos, but the hosts file (and extensions like blocksite and requestpolicy) can.
bokonon said:
I also use the HOSTS file instead of a commercial adblocker.
What the heck is a commercial adblocker? Adblock Plus, IE7Pro, adblock original, admuncher, privoxy... As far as I know there are no non-freeware adblockers out there that anybody in the world actually uses. There's even very little shareware. If we're not paying for it, it's not commercial.
---
Myself, I use
*
adblock plus
*
Stylish
*
NoScript
*
RequestPolicy
and the hosts file, to prevent ads. I get more security with extensions like Redirect Remover, Perspectives, and Better Privacy. I get my hosts file primarily from
http://hostsfile.mine.nu/ . They have several hosts file for different uses. Some for ads, some for malware, some for pornography. Plus combo files. I use the comprehensive file. Beyond that, Spybot Search&Destroy also updates my hosts file, and sets up cookie/image protection inside all browsers.
Ads? No way. False positives? Rarely.
The only thing I can think of to make my browser safer is, if only the
SafeHistory and
SafeCache extensions would be updated to work with FF 3.*.