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

• http://kb.mozillazine.org/userChrome.css

See:

• http://kb.mozillazine.org/Editing_configuration

@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"); /* only needed once */
#identity-icon-label { display:none!important; }

very perfect! Xactly what i expected!

Thank you!!

should definitely be included in Firefox, at least as a configurable option!

You're welcome.

You could also create a new toolbar and move some or all of your add-on icons to it, freeing space on your Navigation toolbar. Of course, that takes additional vertical space.

1. To create a new toolbar, open the Customize window
   • click Firefox button > Options > Toolbar Layout
   • using the Menu Bar, click View > Toolbars > Customize
   • right-click an empty space in a toolbar and choose Customize
2. At the mid bottom of the Customize window click Add New Toolbar and give the new toolbar a name
3. drag an add-on icon to it from your Navigation toolbar to the new toolbar that is displayed; drag as many as you wish to the new toolbar but you must have at lease one item on it for it to remain before clicking Done at the bottom right of the Customize window.

See How can I add extra toolbars

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Here is a variation that shows the label on hover.

@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");
#identity-icon-labels { display:none!important; }
#identity-box:hover #identity-icon-labels { display:block!important; }

yes! rocks! genius