The default is the Status Bar Icon and the second method is using the Toolbar Icon.
Keep in mind that you do not have to have a particular extension installed to get to monitor it.
To add an extension to the list left opt for Toolbar Button or the Status Bar Icon.
You will see the following confirmation window asking if you want to track that particular extension.
Click Yes to add it to your list.
The Bell Icon will disappear while the update check is in progress.
During our tests the countdown always started at 4 and closed when 1 was reached.
