The controls belong to the viewing service
After selecting an option, find pause, volume, seek, full screen and subtitles in that player's interface. Supernova does not replace the destination player, and the available controls vary between apps, browsers and devices.
Small-window and speed options
Picture-in-Picture can keep a supported video in a small window. Playback speed may be useful for some factual programs, but it changes timing and music. Use these only where the player offers them rather than assuming a browser shortcut will create the feature.
Keyboard focus matters
A key may scroll the page if the player does not have focus. Click the player and consult its shortcut help before trying again. On a television, the remote's back button may exit the title instead of closing an overlay.
If automatic quality changes are distracting, inspect the service's quality options. For text readability, use the subtitle guide. For repeated stops, check where playback is failing before changing several settings at once.