♥♥♥♥ i hate writing manifest files.
To use this extension with Adblock Plus, click on the Adblock extension icon, click "Option", and then click "Add your own filters".
Using the filter "@@https://www.youtube.com/*disableadblock=true$document"; (Without quotes), you will be able to disable adblock on any YouTube video that has "disableadblock=true" in the URL. This extension will add that to the url for any video from a channel that you are subscribed to.