Allows to you request any API with ajax from any source.
Developer tool. Makes it possible to communicate with APIs who isn't CORS enabled. Unlike other similar extensions it also handles requests that are "preflighted" with the OPTIONS method. It monkey patch the XMLHttpRequest object and sends cross domain requests through the extension (who isn't cross domain restricted).
Instruction: Click on the icon to enable CORS or use enableCrossOrigin.js (available on the support link/GitHub) and include that on your page for auto enabling CORS.