[Solving]Adblock and Flashblock make youtube cant be played

1. Make sure you have Adblock (Plus) installed.
2. Click on ABP drop-down list, then Filter preferences.
3. Click on Custom filters tab, then Add filter button.
4. Add the following rule all on one line:
youtube.com##div#theater-background.player-height
5. The rule should be enabled by default.
6. Enjoy (you may need to reload your YT page).

Reduced 50% CPU usage on facebook.com

Install adblock plus, add custom filter, add group filter, add filter.

Add this filter below, line by line. See screenshot below

filter :

facebook.com###leftCol div.rfloat
facebook.com##span.uiSideNavSpinner


in my case is decreased until 25%, fair enough than 50%.