firefox css

#urlbar .urlbar-input-box {
   text-align: center;
}

#toolbar-menubar, #TabsToolbar {
  background-color: white !important;
}

.titlebar-close {
list-style-image: url("https://i.imgur.com/r1lB4U1.png") !important;
}

window:not([sizemode="maximized"]) > #titlebar{
    margin-bottom: -31px !important;
}

.tabbrowser-tab .tab-line {
    background-color: #6D6796 !important;
    color: #6D6796 !important;
}

:root[sizemode="normal"]{ border-top-width: 0px !important }

#urlbar {
   border-color: #6D6796 !important;
}

.titlebar-spacer[type="pre-tabs"]
{
display: none !important;
}

/* Fix back button */
#back-button>.toolbarbutton-icon {
transform: scale(.85, .85) !important;
animation: none !important;
border: none !important;
box-shadow: none !important;
}

#back-button:not(:hover),
#back-button:not(:hover) > .toolbarbutton-icon {
background: none !important;
}

#back-button:hover,
#back-button:hover > .toolbarbutton-icon {
border-radius: 2px !important;
}

:-moz-any(#content,#appcontent) browser {
margin-right:-18px!important;
overflow-y:scroll;
margin-bottom:-1px!important;
overflow-x:scroll;
}

.titlebar-close {
  transform: scale(.8) !important;
}