Strange tooltip issue in Firefox

Factual Questions
1

I’m having this strange issue in Firefox since the weekend - tooltips are appearing vertically, rather than a sensible horizontal size.

See here.

Anyone know what this is, and how I can fix it? This is FF 3.0, running on Windows XP. I’ve tried restarting both FF and Windows, without success.

2

Bump

3

This addon should help.

4

Thanks lalenin. The problem appears to have resolved itself, by some strange process that did not involve my intervention. Weirder things have happened, I suppose…