Amazon Prime Videoで操作追加 is a Firefox extension designed to enhance the user experience of the Japanese version of Amazon Prime Video. This subscription-based tool introduces several features that allow users to customize video playback, including speed adjustments from 0.1x to 5.0x, and easy toggling of full-screen mode with a double-click. Additionally, it enables quick navigation through videos using the Q/W/E keys for speed changes, and the numeric keypad for seeking through the video timeline.

The extension also supports intuitive mouse controls, allowing users to rewind or fast-forward by scrolling the mouse wheel. These functionalities can be easily toggled on or off using checkboxes, providing flexibility according to user preference. The latest version, 1.1, ensures that the script only activates when the title tag includes "Prime Video," optimizing performance and compatibility for users.