A new version of the toolbar has been released today, which adds a new feature and fixes a few bugs.
The new feature displays the nearest postcode for each property in the sidebar based on the latitude/longitude show on the website. If a property doesn't have a postcode next to it, view the property details (ie the webpage with the google map on it) and property-bee will work out the postcode for you. In addition the postcode is automatically shared with other users, ie next time they view the property (even if the don't look at the property details) they will automatically see the postcode.
You can download the latest version of the toolbar from here.