Caoutchouc is set of common features (templating, DOM Utils) and a set of asbtraction around browsers' extension APIs.

Your extension must use Require.js, simply require init.js, then browser will be detected and you will be able to use abstracted features trough the browser class.

For example:

require(['caoutchouc/init'], function (coreInit) {
    require(['caoutchouc/browser'], function (browser) {
        var tabs = browser.get('tabs');

        tabs.open('https://www.google.com/');
    });
});