Manga Mark is a free Chrome add-on developed by Quyen that allows users to read and store their favorite manga. This add-on requires users to create an account and generate an API key in order to access its features. Once logged in, users can enjoy reading manga from a variety of supported sites, including nettruyen.com, nhattruyen.com, truyentranhaudio.online, mangatx.com, mangakakalot.com, a3manga.com, shieldmanga.club, truyensieuhay.com, truyentranhaudio.com, truyenz.info, mangareader.net, mangadex.org, mangafoxfull.com, webtoon.xyz, and webtoons.com.

Manga Mark provides a convenient way to access and organize manga from multiple sites in one place. Users can easily navigate through chapters and pages, bookmark their progress, and save their favorite manga for offline reading. With its user-friendly interface and extensive library of supported sites, Manga Mark is a must-have tool for manga enthusiasts.