One of the recent updates to Firebug broke a "feature" I used all the time: the ability to select a link with the element inspector, then edit that link's :hover pseudo-class style rules. Well, it turns out that technically, that "feature" was a bug (though I might argue against that fact). In newer versions of Firebug, you have to:

1. Click the element inspector
2. Click the link you're interested in editing
3. Select the :hover pseudo-class menu item in the Style tab's drop-down menu
4. Edit the rule as you like

This new option allows you to "lock" the element in the :hover state, the usefulness of which I can understand. At the same time, it would be great to have an option (perhaps a hidden preference) to bring back the old behavior.