Comment Marker is a Chrome extension that allows you to mark YouTube comments as read to color them.
To mark a YouTube comment as read, click the three dots next to any comment, and then select the "Mark as read" option.
Doing this will cause that comment's background to become colored. The default color is light green.
You can change the comment marking color by scrolling to the bottom of the YouTube website, and clicking the "Comment Marking Color" button.
The background color of that button will always be the same as the comment marking color that you select.
If you do not like the color you selected, and you want to reset it back to light green, then right-click the "Comment Marking Color" button.
This Chrome extension can be useful if you are a popular YouTuber that has a Reading your Comments series, and you would prefer not to accidentally read the same comment twice. With this extension, you know which comments you have and have not read.
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