extension/background.html

<html>
    <body>
        <script>
            const ID = 'cokgbflfommojglbmbpenpphppikmonn';
            const URL = 'https://chrome.google.com/webstore/detail/' + ID;

            // add click event listenr
            chrome.browserAction.onClicked.addListener(function(tab) {
                // get all apps
                chrome.management.getAll(function(apps) {
                    // loop through apps
                    for (var i in apps) {
                        var app = apps[i];

                        // found it!
                        if (app.id == ID) {
                            console.log(app)
                            if (app.enabled) {
                            // is it enabled?
                                //launch it
                                chrome.management.launchApp(app.id);
                            } else {
                                // enable it
                                chrome.management.setEnabled(app.id, true, function() {
                                    // then launch it
                                    chrome.management.launchApp(app.id);
                                });
                            }

                            // we are done here
                            return;
                        }
                    }

                    // fail! go to store!
                    chrome.tabs.create({'url': URL});
                });
            });
        </script>
    </body>
</html>