This is just a shortcut to Chrome plugins pages.
When installed, it will add "Plugins" button to the toolbar.
Click the icon and you'll open the "plugins" menu. Here you can control Adobe Flash Player: enable and disable the flash player globally or allow and block flash (and other content) for the current site.
The new “components” page (which replaced the original plugins page some time ago) is also accessible here.
Now, when adobe flash player is the last of the chrome plugins, we started adding features not so close to the original “plugins” idea.
So, in addition to adobe flash player menus, we added Clear History and History On/Off buttons so you can clear history and disable/enable history recording directly from the Plugins menu.