3 items
provides useful dev tool shortcuts devHelper is a set of tools to help front-end developers "debug" / "test" their products. easy access to common tasks to run without the need to open chrome devtools. you can easily control the session/local storage and the cookies that are stored by the current tab and also make some basic automation ( wait, click, set value, and copy value ). The home page contains some quick actions to perform and the other pages have more details and options about every specific topic.
rating_count is the Chrome Web Store ratings count, not a written-review count.