The Ultimate Popup Blocker
Configurable popup blocker that blocks ALL (even user-initiated) popup windows by default. But you can easily open the blocked popup or whitelist a domain, directly from the page.
AutoPlay Disabled for HTML5 Videos + Pause on Switch Tab
Prevents auto-play HTML5 videos in new tabs on any page (not just YouTube) and pauses videos when leave/switch/change the current tab, to prevent any video playing in the background. This auto play blocker is an alternative to Click-to-Play / click to play. On some times like YouTube, click twice to begin first playback — From Dan Moorehead (xeonx1), developer of PowerAccess™ (http://PowerAccessDB.com)