react dev tools not loading in Chrome browser
If you opened a local html file in your browser (file://...) then you must first open chrome extensions and check off "Allow access to file URLs".
You no longer need to do anything.
For older react versions, the main requirement is that window.React is set. If you're using a module system:
if (typeof window !== 'undefined') { window.React = React;}This should usually be done in your main source file.
That message always displays, even if the React dev tools are installed and working on the current page. This will be fixed in 0.12 (and is already fixed in master). See https://github.com/facebook/react/pull/953.