Google Doesn’t Support Firefox
Google, of all companies! They’re offering a “Custom Button” feature for the Google Toolbar, but guess what?
It doesn’t work in Firefox!
Custom Buttons Not Available for Your Browser
Unfortunately, we don’t currently have a version of the Google Toolbar for your browser that supports custom buttons.
You can install the Google Toolbar for Internet Explorer 6 or later, which supports custom buttons. Download now.
Once you’ve installed the Toolbar, use Internet Explorer to open page where you found the custom button and try installing it again.
Uh, yeah, I’m going to get IE6+ just because you said so. No thanks.
A little update needed here: google toolbar with custom buttons works with firefox (either windows or linux versions) as of march 2007