Is it possible to setup a custom toolbar icon which opens a website (say finance.yahoo.com) and uses the stock symbol of my open chart as a parameter to the URL?

hey x1..... thats really more a function of the web resources.... it's a snap to do and  accomplishes your goal exactly .....

the online trading toolbar can be reprogramed  for purposes other than trading.... so you have some flexibility there, but web resources route  is the way to go.....h