Ich kann zwar grundsätzlich damit leben, kann mir ja die Seite in „Edge“ ansehen, aber es würde mich schon interessieren, wieso ich die Seite in „Firefox“ nicht öffnen kann.
Diese Frage solltest du dem Betreiber der Webseite stellen... 
Als Erweiterungen sind nur „Norton Safe Web...
Den ganzen Kram von Norton solltest du deinstallieren.
Es wäre nicht das erste Mal, daß das für Fehler sorgt.
Der Windows-Defender kann das (mindestens) genauso gut und macht keine Probleme...
Kann ich irgendwie wieder zu der 110 Version von Firefox downgraden?
Dafür gibt es hier keine Hilfe!
Gib uns mal genauere Infos zu deinem System: about:support in die Adreßleiste eingeben. Auf der Seite, die sich dann öffnet, klickst du auf "Text in Zwischenablage kopieren" und fügst das in deinem nächsten Post hier mittels des Buttons "Code" (3. Button von rechts oben im Editor) ein.
Welche Version ist denn jetzt die aktuelle? Durch dieses Gespringe zwischen den zwei Threads habe ich den Überblick verloren... 
Hast du doch gut gelöst so
Wenn du meinst...
In welcher Zeile?
Zeilen 267-289
Ohne die geht es nicht - oder doch?
Ich sag ja: Anfänger mit Null-Ahnung von Java-Script...
Ich mußte aber auch weiter unten noch was einbauen - speziell das meinte ich mit dem "ob das eleganter zu lösen geht"...
Klar, die Zeilen 4+5 sind ja von mir... 
Ich habe mich mal an dem Skript aus #27 versucht... 
Für alle, die gerne eine andere Farbe beim Hovern der Pfeile hätten, hier mein Ergebnis:
"use strict";
/* Firefox userChrome.js tweaks - 'Custom Scrollbars' for Firefox
https://github.com/Aris-t2/CustomJSforFx/blob/master/scripts/custom_scrollbars.uc.js
Version: 2.0.1 for Firefox 111+
NOTE: 'non-compatible options' from earlier versions were removed
README
about:config >
widget.windows.overlay-scrollbars.enabled > false (Windows)
widget.gtk.overlay-scrollbars.enabled > false (Linux)
[!] The above preferences have to be set to 'false' for this code to work
[!] STARTUP CACHE HAS TO BE DELETED AFTER EVERY CHANGE!
-> finding 'startupCache' folder: address bar > about:profiles > Local Directory > Open Folder > startupCache
-> close Firefox
-> delete 'startupCache' folders content
Modifying appearance > change values
- enable/disable options: true <-> false
- color
- name: red, blue, transparent
- hex code: #33CCFF, #FFF
- rgb(a): rgba(0,0,255,0.8)
- hsl(a): hsla(240,100%,50%,0.8)
- numbers: 1, 2, 3 ... 10, 11, 12 ...
- opacity: 0.0 to 1.0 e.g. 1.4, 1,75
- gradients: linear-gradient(direction, color, color, color)
- gradients example: linear-gradient(to right, blue, #33CCFF, rgba(0,0,255,0.8))
- predefined gradients: transparent,rgba(255,255,255,0.5),transparent -> transparent,rgba(255,255,255,0.0),transparent
- no color or no color value -> use "unset"
*/
(function() {
/* General scrollbar settings *******************************************************/
// default: hide_scrollbars = false
const hide_scrollbars = false;
// default: hide_scrollbar_buttons = false
const hide_scrollbar_buttons = false;
// default: thin_scrollbars = false / browsers own way to show thin scrollbars
const thin_scrollbars = false;
// default: custom_scrollbar_opacity = false
const custom_scrollbar_opacity = false;
// default: custom_opacity_value = "1.0"
const custom_opacity_value = "1.0";
/* Custom scrollbar settings ("custom_scrollbar_" --> "cs_") ************************/
// default: custom_scrollbars = true
const custom_scrollbars = true;
// default: custom_scrollbar_arrows = true
const custom_scrollbar_arrows = true;
// default: custom_scrollbar_arrows_color = "grey"; / # ==> %23 e.g. #33CCFF ==> %2333CCFF
const custom_scrollbar_arrows_color = "green";
//definiert die Hoverfarbe für die Scrollbuttons
const custom_scrollbar_arrows_hover_color = "red";
// default: cs_thumb_border = 0 / in px
const cs_thumb_border = 1;
// default: cs_thumb_roundness = 0 / in px
const cs_thumb_roundness = 5;
// default: cs_buttons_border = 0 / in px
const cs_buttons_border = 0;
// default: cs_buttons_roundness = 0 / in px
const cs_buttons_roundness = 0;
// default: cs_ignore_color_gradients = false / 'flat' scrollbars
const cs_ignore_color_gradients = true;
/* Custom scrollbar colors and gradients ********************************************/
// default: cs_background_color = "#DDDDDD"
const cs_background_color = "#171717";
// default: cs_background_image_vertical = "linear-gradient(to right,transparent,rgba(255,255,255,0.5),transparent)"
let cs_background_image_vertical = "linear-gradient(to right,transparent,rgba(255,255,255,0.5),transparent)";
// default: cs_background_image_horizontal = "linear-gradient(to bottom,transparent,rgba(255,255,255,0.5),transparent)"
let cs_background_image_horizontal = "linear-gradient(to bottom,transparent,rgba(255,255,255,0.5),transparent)";
// default: cs_corner_background_color = "#DDDDDD" / - corner
const cs_corner_background_color = "#171717";
// default: cs_corner_background_image = "linear-gradient(45deg,transparent 30%,rgba(255,255,255,0.5) 50%,transparent 70%),linear-gradient(-45deg,transparent 30%,rgba(255,255,255,0.5) 50%,transparent 70%)"
let cs_corner_background_image = "linear-gradient(45deg,transparent 30%,rgba(255,255,255,0.5) 50%,transparent 70%),linear-gradient(-45deg,transparent 30%,rgba(255,255,255,0.5) 50%,transparent 70%)";
// default: cs_thumb_color = "#33CCFF" / thumb/slider
const cs_thumb_color = "rgb(80,80,80)";
// default: cs_thumb_image_vertical = "linear-gradient(to right,transparent,rgba(255,255,255,0.5),transparent)"
let cs_thumb_image_vertical = "linear-gradient(to right,transparent,rgba(255,255,255,0.5),transparent)";
// default: cs_thumb_image_horizontal = "linear-gradient(to bottom,transparent,rgba(255,255,255,0.5),transparent)"
let cs_thumb_image_horizontal = "linear-gradient(to bottom,transparent,rgba(255,255,255,0.5),transparent)";
// default: cs_thumb_hover_color = "#66FFFF"
const cs_thumb_hover_color = "rgb(50,50,52)";
// default: cs_thumb_hover_image_vertical = "linear-gradient(to right,transparent,rgba(255,255,255,0.5),transparent)"
let cs_thumb_hover_image_vertical = "linear-gradient(to right,transparent,rgba(255,255,255,0.5),transparent)";
// default: cs_thumb_hover_image_horizontal = "linear-gradient(to bottom,transparent,rgba(255,255,255,0.5),transparent)"
let cs_thumb_hover_image_horizontal = "linear-gradient(to bottom,transparent,rgba(255,255,255,0.5),transparent)";
// default: cs_thumb_border_color = "#33CCFF"
const cs_thumb_border_color = "rgb(0,200,0)";
// default: cs_buttons_color = "#66FFFF" / buttons
const cs_buttons_color = "#171717";
// default: cs_buttons_image_vertical = "linear-gradient(to right,transparent,rgba(255,255,255,0.5),transparent)"
let cs_buttons_image_vertical = "linear-gradient(to right,transparent,rgba(255,255,255,0.5),transparent)";
// default: cs_buttons_image_horizontal = "linear-gradient(to bottom,transparent,rgba(255,255,255,0.5),transparent)"
let cs_buttons_image_horizontal = "linear-gradient(to bottom,transparent,rgba(255,255,255,0.5),transparent)";
// default: cs_buttons_hover_color = "#33CCFF"
const cs_buttons_hover_color = "#171717";
// default: cs_buttons_hover_image_vertical = "linear-gradient(to right,transparent,rgba(255,255,255,0.5),transparent)"
let cs_buttons_hover_image_vertical = "linear-gradient(to right,transparent,rgba(255,255,255,0.5),transparent)";
// default: cs_buttons_hover_image_horizontal = "linear-gradient(to bottom,transparent,rgba(255,255,255,0.5),transparent)"
let cs_buttons_hover_image_horizontal = "linear-gradient(to bottom,transparent,rgba(255,255,255,0.5),transparent)";
// default: cs_buttons_border_color = "#33CCFF"
const cs_buttons_border_color = "#33CCFF";
/* ******************************************************************************************** */
/* ******************************************************************************************** */
// unset background image color gradients -> flat scrollbars
if(cs_ignore_color_gradients === true)
cs_background_image_vertical
= cs_background_image_horizontal
= cs_corner_background_image=cs_thumb_image_vertical
= cs_thumb_image_horizontal
= cs_thumb_hover_image_vertical
= cs_thumb_hover_image_horizontal
= cs_buttons_image_vertical
= cs_buttons_image_horizontal
= cs_buttons_hover_image_vertical
= cs_buttons_hover_image_horizontal
= "unset";
let custom_scrollbars_code='';
let custom_scrollbar_arrows_code='';
let hide_scrollbar_buttons_code='';
let custom_scrollbar_opacity_code='';
let hide_scrollbars_code='';
let thin_scrollbars_code='';
if(custom_scrollbars === true)
custom_scrollbars_code=`
slider, scrollcorner, scrollbar thumb, scrollbar scrollbarbutton {
appearance: auto;
-moz-default-appearance: none !important;
}
slider {
background-color: `+cs_background_color+` !important;
}
scrollbar[orient="vertical"] slider {
background-image: `+cs_background_image_vertical+` !important;
}
scrollbar[orient="horizontal"] slider {
background-image: `+cs_background_image_horizontal+` !important;
}
scrollcorner {
background-color: `+cs_corner_background_color+` !important;
background-image: `+cs_corner_background_image+` !important;
}
scrollbar thumb {
background-color: `+cs_thumb_color+` !important;
border-radius: `+cs_thumb_roundness+`px !important;
box-shadow: inset 0 0 0 `+cs_thumb_border+`px `+cs_thumb_border_color+` !important;
}
scrollbar thumb[orient="vertical"] {
background-image: `+cs_thumb_image_vertical+` !important;
min-height: `+(12+cs_thumb_roundness+cs_thumb_border)+`px !important;
}
scrollbar thumb[orient="horizontal"] {
background-image: `+cs_thumb_image_horizontal+` !important;
min-width: `+(12+cs_thumb_roundness+cs_thumb_border)+`px !important;
}
scrollbar thumb:hover, scrollbar thumb:active {
background-color: `+cs_thumb_hover_color+` !important;
}
scrollbar thumb[orient="vertical"]:hover, scrollbar thumb[orient="vertical"]:active {
background-image: `+cs_thumb_hover_image_vertical+` !important;
}
scrollbar thumb[orient="horizontal"]:hover, scrollbar thumb[orient="horizontal"]:active {
background-image: `+cs_thumb_hover_image_horizontal+` !important;
}
scrollbar scrollbarbutton {
background-color: `+cs_buttons_color+` !important;
border-radius: `+cs_buttons_roundness+`px !important;
box-shadow: inset 0 0 0 `+cs_buttons_border+`px `+cs_buttons_border_color+` !important;
height: 15px !important;
width: 15px !important;
}
scrollbar[orient="vertical"] scrollbarbutton {
background-image: `+cs_buttons_image_vertical+` !important;
}
scrollbar[orient="horizontal"] scrollbarbutton {
background-image: `+cs_buttons_image_horizontal+` !important;
}
scrollbar scrollbarbutton:hover {
background-color: `+cs_buttons_hover_color+` !important;
}
scrollbar[orient="vertical"] scrollbarbutton:hover {
background-image: `+cs_buttons_hover_image_vertical+` !important;
}
scrollbar[orient="horizontal"] scrollbarbutton:hover {
background-image: `+cs_buttons_hover_image_horizontal+` !important;
}
`;
if(custom_scrollbar_arrows === true)
custom_scrollbar_arrows_code=`
scrollbar[orient="vertical"] > scrollbarbutton[type="decrement"] {
background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='`+custom_scrollbar_arrows_color+`' %3E%3Cpath d='m7.247 4.86-4.796 5.481c-.566.647-.106 1.659.753 1.659h9.592a1 1 0 0 0 .753-1.659l-4.796-5.48a1 1 0 0 0-1.506 0z'/%3E%3C/svg%3E ") !important;
background-repeat: no-repeat !important;
background-position: center center !important;
}
scrollbar[orient="vertical"] > scrollbarbutton[type="increment"] {
background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='`+custom_scrollbar_arrows_color+`' %3E%3Cpath d='M7.247 11.14 2.451 5.658C1.885 5.013 2.345 4 3.204 4h9.592a1 1 0 0 1 .753 1.659l-4.796 5.48a1 1 0 0 1-1.506 0z'/%3E%3C/svg%3E ") !important;
background-repeat: no-repeat !important;
background-position: center center !important;
}
scrollbar[orient="horizontal"] > scrollbarbutton[type="decrement"] {
background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='`+custom_scrollbar_arrows_color+`' %3E%3Cpath d='m3.86 8.753 5.482 4.796c.646.566 1.658.106 1.658-.753V3.204a1 1 0 0 0-1.659-.753l-5.48 4.796a1 1 0 0 0 0 1.506z'/%3E%3C/svg%3E ") !important;
background-repeat: no-repeat !important;
background-position: center center !important;
}
scrollbar[orient="horizontal"] > scrollbarbutton[type="increment"] {
background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='`+custom_scrollbar_arrows_color+`' %3E%3Cpath d='m12.14 8.753-5.482 4.796c-.646.566-1.658.106-1.658-.753V3.204a1 1 0 0 1 1.659-.753l5.48 4.796a1 1 0 0 1 0 1.506z'/%3E%3C/svg%3E ") !important;
background-repeat: no-repeat !important;
background-position: center center !important;
}
scrollbar[orient="vertical"] > scrollbarbutton[type="decrement"]:hover {
background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='`+custom_scrollbar_arrows_hover_color+`' %3E%3Cpath d='m7.247 4.86-4.796 5.481c-.566.647-.106 1.659.753 1.659h9.592a1 1 0 0 0 .753-1.659l-4.796-5.48a1 1 0 0 0-1.506 0z'/%3E%3C/svg%3E ") !important;
background-repeat: no-repeat !important;
background-position: center center !important;
}
scrollbar[orient="vertical"] > scrollbarbutton[type="increment"]:hover {
background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='`+custom_scrollbar_arrows_hover_color+`' %3E%3Cpath d='M7.247 11.14 2.451 5.658C1.885 5.013 2.345 4 3.204 4h9.592a1 1 0 0 1 .753 1.659l-4.796 5.48a1 1 0 0 1-1.506 0z'/%3E%3C/svg%3E ") !important;
background-repeat: no-repeat !important;
background-position: center center !important;
}
scrollbar[orient="horizontal"] > scrollbarbutton[type="decrement"]:hover {
background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='`+custom_scrollbar_arrows_hover_color+`' %3E%3Cpath d='m3.86 8.753 5.482 4.796c.646.566 1.658.106 1.658-.753V3.204a1 1 0 0 0-1.659-.753l-5.48 4.796a1 1 0 0 0 0 1.506z'/%3E%3C/svg%3E ") !important;
background-repeat: no-repeat !important;
background-position: center center !important;
}
scrollbar[orient="horizontal"] > scrollbarbutton[type="increment"]:hover {
background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='`+custom_scrollbar_arrows_hover_color+`' %3E%3Cpath d='m12.14 8.753-5.482 4.796c-.646.566-1.658.106-1.658-.753V3.204a1 1 0 0 1 1.659-.753l5.48 4.796a1 1 0 0 1 0 1.506z'/%3E%3C/svg%3E ") !important;
background-repeat: no-repeat !important;
background-position: center center !important;
}
`;
if(hide_scrollbar_buttons === true)
hide_scrollbar_buttons_code=`
scrollbar scrollbarbutton {
opacity: 0 !important;
}
scrollbar[orient="vertical"] scrollbarbutton {
min-height: 1px !important;
height: 1px !important;
max-height: 1px !important;
}
scrollbar[orient="horizontal"] scrollbarbutton {
min-width: 1px !important;
width: 1px !important;
max-width: 1px !important;
}
`;
if(custom_scrollbar_opacity === true)
custom_scrollbar_opacity_code=`
scrollbar {
opacity: `+custom_opacity_value+` !important;
}
`;
if(hide_scrollbars === true)
hide_scrollbars_code=`
scrollbar, scrollcorner {
display: none !important;
visibility: collapse !important;
}
`;
if(thin_scrollbars === true)
thin_scrollbars_code=`
:root{
scrollbar-width: thin !important;
}
`;
Components.classes["@mozilla.org/content/style-sheet-service;1"]
.getService(Components.interfaces.nsIStyleSheetService)
.loadAndRegisterSheet(Services.io.newURI("data:text/css;charset=utf-8," + encodeURIComponent(`
`+custom_scrollbars_code+`
`+custom_scrollbar_arrows_code+`
`+hide_scrollbar_buttons_code+`
`+custom_scrollbar_opacity_code+`
`+hide_scrollbars_code+`
`+thin_scrollbars_code+`
`), null, null),
Components.classes["@mozilla.org/content/style-sheet-service;1"]
.getService(Components.interfaces.nsIStyleSheetService).AGENT_SHEET);
})();Keine Ahnung, ob das eleganter zu lösen geht - ich bin froh, es überhaupt hingekriegt zu haben!
Auch von mir herzlichen Dank - sieht wieder hübsch aus. 
ArisCTR :
Siehst du eine Chance, die Scrollbuttons noch wieder anpaßbar zu machen?
Aufgefallen ist es mir auch jetzt eben erst, als ich deinen Post las.
Aber ich habe hier einen Nightly, der noch auf dem Stand von gestern ist -> ohne Scrollbars...
denn vor dem Update von heute ging es noch
Bei mir funktioniert das Skript auch in einem Nightly von gestern schon nicht mehr...
bzw. gibt es evtl. sogar eine neuere Version von dem Skript?
Schau mal hier: https://github.com/Aris-t2/Custom…crollbars.uc.js
Hab ich allerdings noch nicht getestet...
In der 111 passen auch die beiden anderen Button nicht perfekt:
Jetzt, wo du das sagst: Ganz perfekt paßt der mittlere der drei hier auch nicht - fällt aber kaum auf.
Im Nightly passt es hier:
Bei diesem Bild würde ich nicht von passend sprechen...
Da ist mir die obere Box zu weit rechts.
Könnte am Zoom liegen, oder der Größe vom Bildschirm
Zoom (100%) - Bildschirm FullHD 1920x1080...
Eventuell kann mal jemand probieren, ob es so i.O. ist.
Ich mußte erstmal verdunkeln...
Kann man so nutzen (wenn man so hell mag... )
Den Code von grisu2099 und Endor habe ich mal in die Schleudermaschine gegeben, das kam dabei heraus.
Da kommt mir doch einiges bekannt vor...
Kann sich sehen lassen!
