Enable asynchrounous updating

[pmknutsen]

When I click the extension icon, there is a delay of about seconds before the drop-down list with stock quotes load. The time it takes seems to scale linearly with the number of stocks listed. I assume therefore that prices are loaded by user input, i.e. when the icon is clicked.

Is it possible to have the extension load prices asynchronously, i.e. without user input at a regular interval, say every 5 or 10 minutes?

Some folks may also prefer realtime prices (when available). Thus, an Update button below the list could also be a good idea.

Some other observations:

1. If I remove focus from the icon while prices load, the listing sometimes does not appear.
2. When the list is shown and I remove focus by clicking on a window, it takes 1-2 sec for the list to disappear (it should go away immediately)