642967 - showing/hiding tab strip and url bar in fullscreen causes web page content to reflow/"jump"

Status: UNCONFIRMED

(Firefox :: General, enhancement)

Description

[Reece H. Dunn]

User-Agent:       Mozilla/5.0 (X11; Linux x86_64; rv:2.0b13pre) Gecko/20110317 Firefox/4.0b13pre
Build Identifier: Mozilla/5.0 (X11; Linux x86_64; rv:2.0b13pre) Gecko/20110317 Firefox/4.0b13pre

In fullscreen mode, firefox displays the web page such that it takes up the entire screen. This is good.

The tab strip and url/navigation bar are:
1.  hidden under normal usage in fullscreen mode;
2.  shown when the mouse moves to the top of the screen;
3.  hidden again when the mouse moves away from the tab strip and navigation bar.

When transitioning from 2 to 3 and 3 to 2, firefox resizes the we page area to allow for the now visible/hidden UI elements. This results in the web page "jumping" which is jarring.

Better would be for the tab strip and url/navigation bar to be overlayed on top of the web page so that the page content does not jump.

Reproducible: Always