Firefox XUL Toolbar background image

I have my own toolbar with toolbox and toolbarpalette.

I have followed this https://developer.mozilla.org/en/Skinning_XUL_Files_by_Hand

and background image for toolbar is not displaying, what can be wrong?

Cannot found any debug message in Error console

Note that Image #logoimage is displaying correctly

XUL

<toolbox id="navigator-toolbox" class="nav-box" crop="end">
        <toolbarpalette id="BrowserToolbarPalette">
            <image id="logoimage"/>
            <toolbarbutton type="menu" label="&toolbar.quicklinks.label;" id="quicklin开发者_如何学运维ks">
                <menupopup>
                    <menuitem class="menuitem-iconic" label="&toolbar.quicklinks.quicklink1;" image="chrome://tbar/skin/icon.png"/>
                </menupopup>
            </toolbarbutton>
        </toolbarpalette>
        <toolbar id="test-toolbar"
             class="nav-bar"
             mode="full"
             iconsize="small"
             customizable="true"
             context="toolbar-context-menu"
             toolbarname="Toolbar"
             crop="end"
             defaultset="logoimage,toolbarseparator,quicklinks">
        </toolbar>
    </toolbox>

CSS

toolbar.nav-bar {
    background-image: url("chrome://tbar/skin/tbg.png");
}

#logoimage {
    list-style-image: url("chrome://tbar/skin/logo.png");
}

As nobody could help, I asked in mozilla.dev.tech.xul Google group, and got an answer

Try adding "-moz-appearance: none;" to your CSS stanza. This turns off OS-defined theming.

And that thing simply worked ! It also removes all OS specific look and feel effects

see: https://groups.google.com/group/mozilla.dev.tech.xul/browse_thread/thread/a4cd4452a72b9151#

Given that there are no issues in the code you show here I only see one explanation: the background image is being set to a different value elsewhere, maybe in some built-in CSS file. You can check the CSS rules applying to a particular UI element using DOM Inspector.

Does your toolbar have a height and width? I can't remember if they're block by default, but it might not be showing because it has no dimensions?