HennWeb

Wird im Profilverzeichnis von Firefox ein Unterverzeichnis mit der Bezeichnung „chrome“ und darin eine Datei „userContent.css“ abgelegt, sind darüber alle denkbaren CSS-Anpassungen für jede beliebige Webseite umsetzbar – ganz ohne Erweiterung. Nach dem gleichen Prinzip können über die Datei „userChrome.css“ beliebige Design-Anpassungen an der Firefox-Oberfläche vorgenommen werden. diese müssen ins Profil Verzeichnis in den Ordner „chrome“

https://github.com/ardiman/userChrome.js/wiki/Skriptliste

resource://gre-resources/html.css
chrome://browser/content/browser.css
chrome://browser/skin/browser.css 

http://kb.mozillazine.org/Chrome_element_names_and_IDs

Firefox z.B. gelbe Ordner mit eigener CSS Datei
Datei: userChrome.css
Verzeichnis: C:\Users\conny\AppData\Roaming\Mozilla\Firefox\Profiles\y0gfb4ws.2019-10-15\chrome

/* Lesezeichen Sidebar - Ordnericon stehend gelb */
 
@-moz-document url("chrome://browser/content/places/bookmarksSidebar.xhtml"),
url("chrome://browser/content/history/history-panel.xhtml"),
 url-prefix(chrome://browser/content/places/bookmarksSidebar.xhtml){
treechildren::-moz-tree-image(container) {
list-style-image: url('data:image/png;base64,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')
!important; }
}
 
/* Lesezeichen verwalten - Ordnericon stehend gelb */
@-moz-document url-prefix("chrome://browser/content/places/places.xhtml") {
treechildren::-moz-tree-image(container) {
list-style-image: url('data:image/png;base64,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')
!important; }
}
 
/* Lesezeichen - Ordnericon gelb */
@-moz-document url-prefix("chrome://browser/content/browser.xhtml") {
.bookmark-item[container="true"] {
list-style-image: url('data:image/png;base64,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')
!important;
-moz-image-region: rect(0px 16px 16px 0px) !important; }
}
 
 
.tabbrowser-tab {
    box-sizing: border-box;
    margin: 0 1px 0 1px !important;
    border-radius: 5px 5px 0 0 !important;
}
 
 
.tabbrowser-tab .tab-text.tab-label {
    color: black !important;            /* tab text color - customizable */
}
 
 
.tabbrowser-tab[selected="true"] .tab-text.tab-label {
    color: black !important;            /* tab text color - customizable */
}
 
 
.tabbrowser-tab[selected="true"] .tab-background {
    border: 1px solid gray !important;  /* color is customizable */
    border-bottom: none !important;
    opacity: 1;
}
 
 
.tab-background {
    border: none !important;
    border-radius: 5px 5px 0 0 !important;
    background: black;
    opacity: .1;
}
 
 
.tab-line {                             /* = light top line in selected tab in Quantum default */
    display: none !important;
}
 
 
.tabbrowser-tab:hover,
.tabbrowser-tab .tab-text.tab-label:hover {
    cursor: pointer !important; 
}
 
 
.tabbrowser-tab:hover {
    border: 1px solid grey !important;
}
 
 
.tabbrowser-tab[selected="true"]:hover {
    border: none !important;
}
 
 
[tabsintitlebar]:root:not([extradragspace]) .tabbrowser-tab::after,
.tabbrowser-tab:hover::after,
#tabbrowser-tabs:not([movingtab])>.tabbrowser-tab[beforehovered]::after {
    border: none !important;                /* leave as is; affects the New Tab icon (the plus) */
}
 
 
/* BOOKMARK ICON COLORIZATION */
 
#bookmarks-view treechildren::-moz-tree-image(container),
#PlacesToolbarItems toolbarbutton[container="true"] .toolbarbutton-icon,
#PlacesToolbarItems menu[container="true"] .menu-iconic-left,
#BMB_bookmarksPopup menu[container="true"] .menu-iconic-icon,
#bookmarksMenu menu[container="true"] .menu-iconic-icon {
    fill: #FFCC00 !important;               /* orange; customizable */
    margin-right: 8px;                      /* correction for the Firefox default imperfection */
}
 
 
/* ADDRESS BAR ICONS CLEAN-UP */
 
#pageActionSeparator, #pocket-button, #pageActionButton {
    display: none !important;               /* customizable: delete if you want the objects back */
}