Open the Customize window via "View > Toolbars > Customize" or via "Firefox > Options > Toolbar Layout" and choose: [X] "Use Small Icons"

I tried that but it did not effect the minimize, maximize, close buttons.

You can try to add code like this to userChrome.css below the @namespace line.

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

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

#titlebar-buttonbox .titlebar-button {
 height: 16px !important;
 width: 16px !important;
}

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

You can use the ChromEdit Plus or Stylish extension to have easier access to the customization files.

• ChromEdit Plus: http://webdesigns.ms11.net/chromeditp.html
• Stylish: https://addons.mozilla.org/firefox/addon/stylish/

I have done that, and I have the information to alter it appearance, but I don't want to write a long style that modify the caption buttons in several ways.

I think that if someone knew exactly how the switch to full screen affected the caption buttons, whether it's a script or a change in images, than that person should be able to give a simple config trick to Firefox.

This extension will do the trick but if someone finds a way to do it without an extension, please post here!

lol forgot the link

https://addons.mozilla.org/en-US/firefox/addon/hide-caption-titlebar-plus-sma/