userChrome.css

/* COLOR */
/* HUD Location bar history drop-down */
@import url("chrome://browser/skin/custom/hud_dropdown.css");

/* Gray Favicon to Inactive tabs and Searchbar engine */
@import url("chrome://browser/skin/custom/gray_favicon.css");

/* Light Gray Sidebar */
@import url("chrome://browser/skin/custom/lightsidebar.css");

/* Restore Navigationbar to White */
@import url("chrome://browser/skin/custom/navi-white.css");

/* Dark Downloads Window */
@import url("chrome://browser/skin/custom/darkdownload.css");

/* Dark ScrapBook (add-ons) */
@import url("chrome://browser/skin/custom/dark_scrapbook.css");


/* HIDE */
/* Hide Discover (Get Add-ons) */
@import url("chrome://browser/skin/custom/discover.css");

/* Hide Open All Tabs */
@import url("chrome://browser/skin/custom/remove-openalltabs.css");

/* Hide Sidebar Bookmarks Search */
@import url("chrome://browser/skin/custom/sidebar_searchfield.css");


/* SHOW */
/* Show Bookmarks Toolbar Folder */
@import url("chrome://browser/skin/custom/show_btb_folder.css");

/* Show Sidebar Header */
@import url("chrome://browser/skin/custom/sidebarheader.css");


/* OTHERS */
/* Tab Mix Plus - Tab Close Button Place on left side 
@import url("chrome://browser/skin/custom/tabmixplus_left.css");
When you choose "Tab Close Button" - "Place on left side", you must enable this option.*/

/* New Tab Page Grid Two thirds Size (for large display) */
@import url("chrome://browser/skin/custom/newtab_third.css");

/* Tab Close Button on the Left
@import url("chrome://browser/skin/custom/tabclose_left.css");*/

/* Feed Toolbar Button in Locationbar */
@import url("chrome://browser/skin/custom/feedtoolbar.css");
Before adding code, you have to customize the position of feed button.

/* Search History into Searchbar */
@import url("chrome://browser/skin/custom/searchbarhistory.css");

/* Status Panel in Addon-bar */
@import url("chrome://browser/skin/custom/status-addonbar.css");

/* Firebug Inspect CMI Short Label */
@import url("chrome://browser/skin/custom/fb_cmi_shortlabel.css");