555969 - Abnormal painting when set main-window's background-color to transparent.

Status: NEW

(Firefox :: General, defect)

Description

[zero fire]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.9.2.2) Gecko/20100316 Firefox/3.6.2
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.9.2.2) Gecko/20100316 Firefox/3.6.2

when set the #main-window's CSS style background-color to transparent. There will be several painting issue.

1.every web page in any tab will has an default background colr of gray.
2.Window can't be minimize
3.Task bar button will never popup the right-click-menu
4.web page painting very slow. If Firefox startup with many tabs to load, the application stop response, 50% cpu usage for over half hour, until i shut down the process.
5.If a tooltip (from task bar for example) show up and covers the firefox window, the Firefox window will make a slow painting, seems like the window will always paint the whole rectangle.

Reproducible: Always

Steps to Reproduce:
1.Install test plugin
2.visit this page will have an strange background-color.
  http://www.google.com/firefox
3.click taskbar button to minimize then window
4.right click taskbar button to popup the system menu.
5.Move the Window to nearby the taskbar, hover on task bar button, make sure the tooltip covers the window.
6.open 20 webpage, restart application.
Actual Results:  
1.every web page in any tab will has an default background colr of gray.
2.Window can't be minimize
3.Task bar button will never popup the right-click-menu
4.web page painting very slow. If Firefox startup with many tabs to load, the application stop response, 50% cpu usage for over half hour, until i shut down the process.
5.If a tooltip (from task bar for example) show up and covers the firefox window, the Firefox window will make a slow painting, seems like the window will always paint the whole rectangle.

Expected Results:  
make a way to set the #main-window background to transparent with no issue.
so that i can write my plugin to let the window has a round corner

Comment 1

[zero fire]

Attachment: Transparent Main-Window Background-color

Comment 2

[Mike Kaply [:mkaply]]

Can you attach a screenshot as well?

Comment 3

[Mike Kaply [:mkaply]]

And this isn't just background color transparent - using rgba values with any transparency cause this as well.

I can understand the performance issues, but the face that the titlebar on Windows goes away completely is really strange.

Everything works fine on Mac