You will need to install a user script manager extension to install this script.
I started translating from the original Chinese into English and Russian script "HTML5 video player enhanced script" of the author "ankvps" on 2020-04-23.
The original script written by the author: ankvps.
Script link: https://greasyfork.org/en/scripts/381682
How to change to english?
1. - After instalation, go to menu "Script settings"
2. - Change to "English", save it
3. - That's all
Supported all sites that use HTML5 technology for video playback
Shortcut key list
Whether the shortcut key is available on all web pages, default true Disable / Enable the playback plugin Forward 5 seconds Back 5 seconds Forward 30 seconds Back 30 seconds Volume up 10 Volume down 10 Volume up 20 Volume down 20 Speed Play +0.1 Slow Play -0.1 Normal speed playback Enlarge video screen +10% Reduce video screen -10% Restore video frame Enter or exit PIP function Screenshot, take the current picture and save it Enable or disable automatic resume progress function The screen moves 10px to the right The screen moves 10px to the left The screen moves up 10px The screen moves down 10px Enter full screen Enter webpage full screen Next / episode video (only supported by some websites) Previous frame (fine-tune when taking a screenshot to find the best frame) Next frame (netflix is not supported because of shortcut key conflict) Brightness increase % Brightness reduction % Increased contrast % Reduction in contrast % Increase in saturation % Reduction in saturation % Hue increased by 1 degree Hue reduced by 1 degree Blur increased by 1 px Blur reduction 1 px Image reset Screen rotation 90 degrees