Original bug report was talking about URL above in connection with Adblock Plus (header of the page is black in trunk nightlies), minimized testcase isn't dependent on Adblock Plus however. If a table has only one cell without padding the height of this cell becomes zero instead of being equal to the table height. Minimal testcase attached - in Firefox 2.0, Opera and IE it shows a green rectangle (table cell background), in trunk nightlies the rectangle is red (table background). Regression range is 2006-12-07-04 to 2006-12-08-04, this is reflow branch landing.

Fixed by checkin of bug 403656. (I checked only the testcase in comment 0, not the URL + AdBlock Plus.)

The testcases committed in bug 403656 cover this.