FF userchrome .css

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

#tabbrowser-tabs .tabbrowser-tab .tab-close-button { display:none!important; }

/* Hide Horizontal Tabs */
#main-window[tabsintitlebar="true"]:not([extradragspace="true"]) #TabsToolbar {
  opacity: 0;
  pointer-events: none;
}
#main-window:not([tabsintitlebar="true"]) #TabsToolbar {
    visibility: collapse !important;
}

/* Autohide Sidebar */
/*Collapse in default state and add transition*/
#sidebar-box[sidebarcommand="treestyletab_piro_sakura_ne_jp-sidebar-action"] {
  overflow: hidden;
  min-width: 0px;
  max-width: 0px;
  transition: all 0.2s ease;
  border-right: 1px solid #2b303b;
  z-index: 2;
}

/*Expand to 260px on hover*/
#sidebar-box[sidebarcommand="treestyletab_piro_sakura_ne_jp-sidebar-action"]:hover,
#sidebar-box[sidebarcommand="treestyletab_piro_sakura_ne_jp-sidebar-action"] #sidebar {
  min-width: 260px !important;
  max-width: 260px !important;
}

/* Hide the reload button by default */
#reload-button {
  transition: 300ms !important; /* Animate icon hiding */
  opacity: 0 !important; /* Make icon transparent */
  -moz-margin-end: -2em !important; /* Hide icon by offsetting it */
}

/* Show the reload button on navbar hover or page load (animation/stop button) */
#nav-bar:hover #reload-button,
#stop-reload-button[animate] > #reload-button:not([displaystop]) {
  transition: 300ms !important; /* Animate icon showing */
  opacity: 1 !important;  /* Make the icon opaque */
  -moz-margin-end: initial !important; /* Use initial margins to show the icon */
}

/* Hide info icon for sites that don't have permissions */
#urlbar :not(.grantedPermissions) #identity-icon {
        transition: 300ms !important; /* Animate icon hiding */
	opacity: 0 !important; /* Make icons transparent */
	-moz-margin-end: -1.1em !important; /* Hide icons by offsetting them */
}

/* Show info icon on navbar hover, except for new tab page search icon */
#urlbar[pageproxystate="valid"]:hover #identity-icon {
        transition: 300ms !important; /* Animate icon showing */
	opacity: 1 !important; /* Make icons opaque */
	-moz-margin-end: initial !important; /* Use initial margins to show icons */
}


#urlbar, .searchbar-textbox {
  border: none !important;
  box-shadow: none !important;
}

#urlbar[pageproxystate="valid"] > #identity-box.notSecure > #connection-icon,
#urlbar[pageproxystate="valid"] > #identity-box.insecureLoginForms > #connection-icon,
#urlbar[pageproxystate="valid"] > #identity-box.mixedActiveContent > #connection-icon {
  list-style-image: url("chrome://mozapps/skin/extensions/alerticon-error.svg") !important;
}


#main-window :-moz-any(#back-button, #forward-button) {
  display: none !important;
}


/* Remove the menu button */
#PanelUI-menu-button {
  display: none !important;
}

/* Remove library button */
#library-button {
  display: none !important;
}

#nav-bar, #home-button {
  border-top-width: 0 !important;
 #padding-left: 70px !important;
  padding-top: 0 !important;
  padding-bottom: 0 !important;
  background-color: transparent !important;
  background-image: none !important;
  border-color: transparent !important;
  box-shadow: none !important;
}


#tracking-protection-icon {
  visibility: collapse !important;
}

#identity-box:hover > #tracking-protection-icon {
  visibility: visible !important;
}


.urlbar-history-dropmarker{
  display: none !important;
}

.button-box .button-icon {
    display: none;
}

#PersonalToolbar {
    visibility: collapse !important;
}

#navigator-toolbox:hover > #PersonalToolbar {
    visibility: visible !important;
}

browser {
    margin-right: -17px !important;
    overflow-y: scroll;
    overflow-x: hidden;
    }