Why the React DevTools does not appear in the browser?

Set React Devtools, but the tab never appeared. Before (pereplavka Ubuntu), everything was fine.
July 2nd 19 at 17:00
1 answer
July 2nd 19 at 17:02
You start on a certain server (mamp, webpack-dev-server, etc.)? Dev tools does not work if you just open the html file (address like file:// )
Thanks, you are right. - stanley_Marquardt commented on July 2nd 19 at 17:05

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