How can I fix WebStorm warning “Unresolved function or method” for “require” (Firefox Add-on SDK)

I’m using WebStorm 7 for Firefox Add-on SDK development. WebStorm shows a warning: “Unresolved function or method” for require(). I want to get rid of the warning. var pageMod = require(“sdk/page-mod”); NOTE:I already configured JavaScript-library (refer /lib/sdk globals). Environment: WebStorm 7.0.2 Windows 7 64bit Firefox Add-on SDK 1.15beta1 13 Answers 13