To know why this add-on was created in the first place, check out:
http://sites.google.com/site/jpdge45/meet-the-developer-of-joomla-admin (no ads/spam on this site)
... the fix that this web developer was asking me to create, was simple but would prove to be of great help to many other Joomla! web developers, who found the task of repeatedly switching from 'Administrator' to 'Site' mode for their sites by using the navigation bar (url bar), a repetitive and painful process. .... (For v1.0 and v1.1; the latest releases post v1.1 have a slightly different menu option.)
<u>Current Features of Joomla! Admin:</u>
Administrator: Go from the website homepage to the administrator page in a jiffy!
Template Positions: View template positions corresponding to the present web page!
Duplicate Tab to New Tab: Quickly duplicate your site/administrator page to another tab!
Duplicate Tab to New Tab: Quickly duplicate your site/administrator page to another window!
Chinese(Traditional), Czech, English (US), French, German, Hindi, Italian, Japanese, Polish, Russian and Spanish!!!