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Records the manga chapters you open on sites you have explicitly enabled, and syncs them to your own Chap Tracker instance. Chap Tracker records which manga chapters you have opened on reading sites you explicitly enable, and syncs that reading progress to a self-hosted Chap Tracker server that you run and pair the extension with. It does one thing: keep your chapter progress in one place across the sites you read on.
rating_count is the Chrome Web Store ratings count, not a written-review count.