React Dev tools won't initialize

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I am new to react and am following a tutorial where they ask to install react developer tools. However on installing the react developer tools doesnot light up. It does not activate. I followed the trouble shooting options and allowed access to file URls . yet it still doesnt work.

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What do I need to do to make it work?

Please help

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It appears to me that you are trying to access certain page to check if it's React-written. There are visual indicators when you are looking at React-written page and your DevTools will turn to blue icon, otherwise, something else being used to produce this. For the testing purposes try visiting Facebook page and pay attention to the icon.