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Shows whether the brand you're browsing is a Redo merchant and which products they run. Redo Lookup shows whether the website in the active tab is a Redo merchant. It compares the active tab's hostname against a list of merchant domains bundled inside the extension, then shows a toolbar badge and a popup listing which Redo products that merchant currently uses and which they previously used. That is the extension's only function.
rating_count is the Chrome Web Store ratings count, not a written-review count.