You will need to install a user script manager extension to install this script.
Allows to create, store and access video timestamps.
The menu and timestamps are located below the player.
Timestamps are stored for each video.
The "-" button removes all timestamps for the current video.
The "+" adds one timestamp for the current time of the video.
The "*" shows or hides the export and import buttons.
The "↥" button allows to export timestamps in a txt file, if there's any timestamp.
The "⤓" button allows to import a .txt file containing timestamps. They will be added if the video matches the file.