Auto PauseStop for YouTube is a Firefox extension designed to enhance user control over YouTube video playback. This subscription-based tool provides features like automatic pausing or stopping of videos, allowing users to manage their viewing experience effectively. Users can choose between normal playback and the two modes offered: Auto Pause, which pauses videos while still loading them, and Auto Stop, which halts both playback and loading to conserve bandwidth.

The extension is user-friendly, enabling easy switching between modes via a toolbar popup. It supports both HTML5 and Flash players, ensuring compatibility with various video formats. However, it may not function properly with videos containing advertisements, for which an ad-blocker is recommended. The extension also allows customization of the toolbar icon based on the selected playback mode.