I love ’em. They appeared last night when I loaded Firefox 2.0 on my home computer. Then they disappeared, then they were back again when I used an add-on/theme.
I got to work this morning and here they are – sweet! John’s a total feed and “info at your fingertips” junky and I have to say, this is the first step I’m taking in that direction. Was this an official UI update by Google? It only appeared when I updated Firefox and I know it’s not showing up on John’s Mac.
Found an article here, and some forum talk here – seems like this is old news, but they tab appearances have been spotty.