Firefox stealing focus in Ubuntu

Seeing intermittent, but persistent issues with Firefox windows stealing focus and generally not playing nicely.  This really started with attempts to add receipts on FuelClinic.com.  My efforts to click in that form were a game of click and type fast before Firfeox decided to rescind focus in the forminputs.

My diagnostic steps:

Start in safemode (disabling all add-ons).

firefox-3.5 -safe-mode

Check forms access.  Working.

The add-ons I use are fairly common–AdBlockPlus, FlashBlock, Tab Management and the like.

Currently installed add-ons

My initial thought was that the Tab Management add-ons were causing the problem.  After some digging through settings there, however, no effect was found.

My next step was to enable add-ons one-by-one in Safe Mode.  As luck would have it, the first plugin I re-enabled was the Firefox Extensions for Ubuntu.   Seems like those modifications are known to cause the sorts of problems I was experiencing.

Presto!  That odd bit of Ubuntu seems to be the culprit.  I agree that this should be an optional element of Firefox.