Tools > Addons > Themes

If you are using an add-on Theme, the userChrome.css tweaks you need are more than likely different than what would work with the Default Theme.

And exactly is this supposed to do? I'm using the Default Theme. There is no options for making any changes there.

Did you make changes to the default settings in "Control Panel > Personalization > Window Color and Appearance" ?
Are you using one of the default Windows themes ?

You can try a different Windows theme to see if that works better.

Control Panel > Personalization > Theme

I've used the default Windows as well as some of the other themes, nothing seems to make any difference.

It's just that there's always all this talk about Firefox being so totally customizable when in fact only a very small portion of it actually is. And the part that isn't is a part that affects usage. Not being able to easily see one's place in the bookmarks is a real detrimental usability issue that FF should address as there doesn't currently seem to be a solution.

See http://kb.mozillazine.org/Editing_configuration#How_to_edit_configuration_files

Add code to userChrome.css below the @namespace line.

@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"); /* only needed once */

#bookmarks-view treechildren {background-color:#FFFF99!important}

Great! Finally a solution.

I've tried several similar rules and some not so similar but nothing ever worked -- just more and more frustration.

THANK YOU, cor-el !

Great! Finally a solution.

I've tried several similar rules and some not so similar but nothing ever worked -- just more and more frustration.

THANK YOU, cor-el !