STR: 1. Ensure .mozconfig contains `ac_add_options --enable-debug-js-modules`. 2. Build and run Firefox. 3. Open the DevTools Panel. 4. Select the Memory tab. 5. open the Browser Console. This warning appears the first time the memory panel is selected: "Warning: Failed prop type: Calling PropTypes validators directly is not supported by the `prop-types` package. Use `PropTypes.checkPropTypes()` to call them. Read more at http://fb.me/use-check-prop-types in MemoryApp (created by Connect(MemoryApp)) in Connect(MemoryApp) (created by bound createElementWithValidation) in bound createElementWithValidation in Provider" This appears to be an issue with `devtools/client/memory/app.js` I suspect this has something to do with `childContextTypes()` and `getChildContext()`... not sure how it should be handled though.

This could be a conflict with our current version of Redux.

I have logged bug 1441147 for the redux upgrade.

The redux upgrade made no difference

Comment on attachment 8954064 [details] Bug 1440740 - Calling PropTypes validators directly is not supported when first opening Memory Tool https://reviewboard.mozilla.org/r/223210/#review229476 Looks good

Pushed by mratcliffe@mozilla.com: https://hg.mozilla.org/integration/autoland/rev/808d909f106b Calling PropTypes validators directly is not supported when first opening Memory Tool r=nchevobbe