How to re-enable Unity WebApps in Ubuntu 13.04?

Back in previous versions of Ubuntu I've removed Unity WebApps packages. Now I want to reinstall them.

I use Chromium, installed unity-chromium-extension package. Also reset default dconf settings (see screenshot below).

I'm currently trying to install Grooveshark webapp, as you see already included grooveshark.com domain in the dconf settings, also installed unity-webapps-grooveshark package, but still cant make WebApps work in Ubuntu.

Besides when I go to Chromium settings there is no Desktop Integration properties at all, though 'Unity WebApps Chromium extension" is enabled.

Any thoughts?

UPDATE (Also See UPDATE 2 below): After some package reinstallations I got this message when I visited twitter.com with Chromium:

When I accepted and opened Twitter app from the Dash it was opened as a standalone Chromium app, but there still were no additional Launcher options when I right-clicked the icon. I think it still hasn't integrated properly.

Update 2: I just tried to install Reddit app, accepted the confirmation box in Chromium but Reddit app has not appeared in the Dash. Seems above mentioned Twitter app was a remaining of the times before I removed packages.

Solution 1:

In Chromium, Desktop Integration is changed now to Installed Websites:

Firefox offers the same functionality through the General section:

Until now you sow where you can find the exceptions for web applications and, implicitly, from where to remove this exceptions. Here is a list of sites that support integration in Ubuntu: http://www.omgubuntu.co.uk/2012/07/list-of-that-websites-support-unitys-new-web-apps-feature.

Related to Grooveshark Web App, according with this post, is not working for the new layout of the site.

Next you will see how to manually create a simple web application for the sites that doesn't offer integration in Ubuntu.

To add a new web application from Chromium, go to Tools > Create Application Shortcut...:

Add the application from desktop to Launcher by dragging and drop:

The last thing that you can do is to change the icon of application to a better one. To do this, search in Dash for alacarte to open Main Menu:

In Main Menu search for the application for which you want to change the icon: