I don’t think I mentioned this change before. In Firefox 4, the orange RSS feed icon that used to appear in the address bar for sites that had feed has been removed. In its place, is a new ‘Subscribe’ toolbar button which does the same thing. However, the Subscribe button is not on the toolbar by default. To add, right click on the toolbar and select Customize… and then locate and drag the subscribe button to your toolbar.
My only complaint about the new button is it should be orange (instead of solid black) when you can subscribe to a feed on the current page. It is a light grey when there is nothing to subscribe to on the current page.
Thanks to Percy at Mozilla Links for reminding us about this feature.
Thanks for the heads-up.