Adds a button to flip back video when mirrored
This userscript adds a button to flip back video when mirrored (e.g. to avoid copyright restrictions).
Use the slider under the button "Flip video" to increase or decrease playback speed by .1 steps.
Install the userscript; reload video page; click the button "Flip video".

If the userscript adds no button, reload video page using the following keyboard shortcut:
ctrl (Mac users: cmd) + shift + r
Remember to provide useful infos like operating system, browser name and version, your add-on (Greasemonkey? Tampermonkey? Violentmonkey?).