I'm not sure if this is a bug or a "feature," but it's definitely annoying.
If you upgraded to Firefox 4 last week, you may have noticed that the status bar -- which formerly resided at the bottom of the browser -- is gone. Well, not so much gone as hidden: a pop-up status bar now appears in the lower-left corner whenever you mouse over or click a link.
Except when it doesn't. The other day I noticed that the status bar seemed to have vanished. Turns out it had just relocated -- to the lower-right corner of the screen! The next day, it was back on the left side. Huh?
It took me a few days to figure out what was going on here: whenever the Find bar is visible, the status bar jumps to the right side of the screen. And I use Find all the time, which is why this happened so often.
What's the fix? To my knowledge, there isn't one yet -- other than to close Find (by clicking the little 'x' at the far left) when you're done with it. Hopefully Mozilla will fix this "feature" with the next Firefox update.
This story, "Firefox 4 tip: Why your status bar keeps switching sides" was originally published by PCWorld.