Crap. Another script was causing the problem. I had a script called "CuteMenus - Stylish Edition" that I didn't delete when I went from FF2 to FF3. This was causing the problem.
I actually like the drop-down arrow you supplied for the Google Toolbar better than the FF arrow that's in the URL Bar. Can you post a code that can replace the FF arrow with yours?
Yeah, I'm talking about the statusbar icon. I have 3 other statusbar icons: PopupMaster, Cache Status, and IETab, and none of them have a black border around them. Because of the black border on your Adblock icon, it looks out of place.
About Gecko - Icons (FF3) on Aug 08 2008
About Gecko - Icons (w/o CuteMenus SVG) on Aug 06 2008
About Gecko - Icons2 (w/o CuteMenus SVG) on Aug 04 2008
About Gecko - Icons (w/ CuteMenus SVG) on Jun 30 2008
About Gecko - Icons2 (w/ CuteMenus SVG) on Mar 24 2008
About Gecko - StatusBar Icons (w/ CuteMenus) on Oct 24 2007
About WellRounded 2 on Sep 19 2007
About Firefox - Hide Misc on Apr 09 2007
About Extension Manager - Disabled Exts Crossed Out Norm on Dec 22 2006
About Mr Tech Local Install Restart Icon on Dec 22 2006
About Experimental Adblock Plus icons by Josef Sábl on Nov 26 2006
About Iconic Menubar - Crystal SVG on Nov 24 2006
About Google Image Search - dark gray redesign (vC) on Nov 21 2006
About CuteMenus - Stylish Edition on Nov 19 2006