Custom Wallpaper Button In Firefox Browser

[Jarvice_42]

I wish Firefox had included an update in which the users can have a custom wallpaper button by which they can use wallpaper of their liking for their homepage, sadly even after 3 years of my browser usage i've never seen such an update. I wish they enable this update in the next coming update

[Agentvirtuel]

Hello

An https://connect.mozilla.org/t5/ideas/wallpaper-in-new-tab/idi-p/172

In addition and for information purposes
Firefox advanced customization and configuration options
https://support.mozilla.org/en-US/kb/firefox-advanced-customization-and-configuration
https://superuser.com/questions/1495946/how-do-i-change-the-background-image-of-home-page-in-firefox

userContent.css and by way of illustration

@-moz-document url(about:home) {
    .click-target-container *, .top-sites-list * {
        color: #fff !important ;
        text-shadow: 2px 2px 2px #222 !important ;
    }

    body::before {
        content: "" ;
        z-index: -1 ;
        position: fixed ;
        top: 0 ;
        left: 0 ;
        background: #f9a no-repeat url(img/testimage.png) center ;
        background-size: cover ;
        width: 100vw ;
        height: 100vh ;
    }
}