Speed Ramp by UbaSteve

Speed Ramp gradually increases video playback speed from a start speed to an end speed over a set number of minutes, so you can watch videos faster without the jarring shock of jumping straight to 2x. Set your start speed, end speed, and ramp duration — the speed rises smoothly as you watch. Pause the video and the ramp pauses too, counting only the time you're actually watching.

Features:

Custom playback speed ramp: choose start speed, end speed, and ramp length
Temporary slow-down ("dip") for dense or fast sections — drops the speed briefly, then returns you to the ramp (keyboard shortcut Alt+Shift+D)
Live speed readout, ramp progress, and time remaining
Works on YouTube, Udemy, Coursera, Twitch (VODs), Vimeo, and Nebula
Speed carries across videos in the same tab — set it once per session

Ideal for online courses, lectures, tutorials, podcasts, and anyone training themselves to watch at higher playback speeds.

Privacy: Speed Ramp collects no data, makes no network requests, and stores your settings locally in your browser.