Question about Google Chrome extensions?

I just installed a few Twitter themes and a client to use and it says the application needs 'your data on all websites'. How much data do they need? Can they fetch passwords, keystrokes, and history? Sorry if this is a stupid question, I haven't been using Google Chrome for that long xD|||Hi. No, it's not a stupid question. I found some detailed answers here: http://www.google.com/support/forum/p/Ch…