I don't know how long they've been doing it, but if you visit the Yahoo! homepage using Firefox, after a short while a large banner ad loads at the top of the page, pointing out that you can search Yahoo! directly from the search box built into the browser.
1. Look for the search box in the upper right corner of your browser.
2. Click on the small triangle in the search box.
3. Choose Yahoo!. You're done!

I guess Yahoo! may be a little sensitive that Firefox ships with Google in the #1 position as default search plug-in. I couldn't make up my mind whether it was a very clever piece of marketing dressed up as targeted contextual help, or whether Yahoo! had just shouted "Hey, Idiot!" at me.
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About Martin Belam
I'm a London-based internet consultant and writer, with 8 years experience in product management, information architecture, and user experience design for global brands like Sony, Vodafone, The Guardian and the BBC. I specialise in advising on search, widgets, RSS, online news publishing and bulk email delivery.
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email: martin.belam@currybet.net
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1 comment so far
Of course that only makes sense for people* who haven't moved the search box to somewhere else in their toolbar...
* alright contrarian fiddlers like me.