Skript für benutzerdefinierte Scrollbar funktioniert nicht richtig

"use strict";


/* Firefox userChrome.js tweaks - 'Custom Scrollbars' for Firefox
https://github.com/Aris-t2/CustomJSforFx/blob/master/scripts/custom_scrollbars.uc.js
Version: 2.0.4 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"
- arrow icons
- files have to be downloaded from https://github.com/Aris-t2/CustomJSforFx/tree/master/icons
- files have to be placed inside 'icons' (sub)folder --> 'chrome\icons'
- own svg files can also be used, if they are named up.svg, down.svg, left.svg, right.svg


*/


(function() {




/* General scrollbar settings *******************************************************/


// Scrollbars ausblenden
// default: hide_scrollbars = false
const hide_scrollbars = false;


// Schaltflächen ausblenden
// default: hide_scrollbar_buttons = false
const hide_scrollbar_buttons = true;


//Breite
// default: thin_scrollbars = false / browsers own way to show thin scrollbars
const thin_scrollbars = true;


// benutzerdefinierte Sichtbarkeit
// default: custom_scrollbar_opacity = false
const custom_scrollbar_opacity = true;
// default: custom_opacity_value = "1.0"
const custom_opacity_value = "0.9";


/* 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_version = 1
//  1 ==> SVG arrows as code: might not work on some pages
//  2 ==> SVG arrows as files: files have to be downloaded from
//        https://github.com/Aris-t2/CustomJSforFx/tree/master/icons
//        and placed inside 'chrome\icons' folder
const custom_scrollbar_arrows_version = 1;


// default: custom_scrollbar_arrows_color = "grey"; / # ==> %23 e.g. #33CCFF ==> %2333CCFF
// only for 'custom_scrollbar_arrows_version = 1'
const custom_scrollbar_arrows_color = "grey";


// benutzerdefinierte Schiebereglerrandbreite
// default: cs_thumb_border = 0 / in px
const cs_thumb_border = 1;


// benutzerdefinierte Schiebereglerrundung
// default: cs_thumb_roundness = 0 / in px
const cs_thumb_roundness = 80;


// default: cs_buttons_border = 0 / in px
const cs_buttons_border = 0;


// benutzerdefinierte Schaltflächenrundung
// default: cs_buttons_roundness = 0 / in px
const cs_buttons_roundness = 5;


// default: cs_ignore_color_gradients = false / 'flat' scrollbars
const cs_ignore_color_gradients = false;




/* Custom scrollbar colors and gradients ********************************************/


// CUSTOM SCROLLBAR COLORS/GRADIENTS
// - background
const cs_background_color = "transparent";                // default: cs_background_color = "#DDDDDD"
let cs_background_image_vertical = "transparent";           // default: cs_background_image_vertical = "linear-gradient(to right,transparent,rgba(255,255,255,0.5),transparent)"
let cs_background_image_horizontal = "transparent";         // default: cs_background_image_horizontal = "linear-gradient(to bottom,transparent,rgba(255,255,255,0.5),transparent)"
// - corner
const cs_corner_background_color = "transparent";         // default: cs_corner_background_color = "#DDDDDD" / - corner
let cs_corner_background_image = "unset";             // 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%)"
// - thumb/slider
const cs_thumb_color = "red";                     // default: cs_thumb_color = "#33CCFF" / thumb/slider
let cs_thumb_image_vertical = "unset";                // default: cs_thumb_image_vertical = "linear-gradient(to right,transparent,rgba(255,255,255,0.5),transparent)"
let cs_thumb_image_horizontal = "unset";              // default: cs_thumb_image_horizontal = "linear-gradient(to bottom,transparent,rgba(255,255,255,0.5),transparent)"
const cs_thumb_hover_color = "#2b2c86";                // default: cs_thumb_hover_color = "#66FFFF"
let cs_thumb_hover_image_vertical = "unset";          // default: cs_thumb_hover_image_vertical = "linear-gradient(to right,transparent,rgba(255,255,255,0.5),transparent)"
let cs_thumb_hover_image_horizontal = "unset";        // default: cs_thumb_hover_image_horizontal = "linear-gradient(to bottom,transparent,rgba(255,255,255,0.5),transparent)"
const cs_thumb_border_color = "transparent";              // default: cs_thumb_border_color = "#33CCFF"
// - buttons
const cs_buttons_color = "lightgrey";                   // default: cs_buttons_color = "#66FFFF" "#5b5b66"/ buttons
let cs_buttons_image_vertical = "unset";              // default: cs_buttons_image_vertical = "linear-gradient(to right,transparent,rgba(255,255,255,0.5),transparent)"
let cs_buttons_image_horizontal = "unset";            // default: cs_buttons_image_horizontal = "linear-gradient(to bottom,transparent,rgba(255,255,255,0.5),transparent)"
const cs_buttons_hover_color = "#eeeeee";             // default: cs_buttons_hover_color = "#33CCFF"
const cs_buttons_border_color = "#lightgrey";            // default: cs_buttons_border_color = "#33CCFF" "#5b5b66"
let cs_buttons_hover_image_vertical = "unset";        // default: cs_buttons_hover_image_vertical = "linear-gradient(to right,transparent,rgba(255,255,255,0.5),transparent)"
let cs_buttons_hover_image_horizontal = "unset";      // default: cs_buttons_hover_image_horizontal = "linear-gradient(to bottom,transparent,rgba(255,255,255,0.5),transparent)"




/* ******************************************************************************************** */
/* ******************************************************************************************** */


let ProfilePathChrome = PathUtils.toFileURI(PathUtils.join(PathUtils.profileDir, 'chrome'));




// 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: 17px !important;
}
scrollbar thumb[orient="horizontal"] {
background-image: ${cs_thumb_image_horizontal} !important;
min-width: 17px !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: 17px !important;
width: 17px !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;
}b
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_version === 1)
custom_scrollbar_arrows_code=`
scrollbar scrollbarbutton {
background-repeat: no-repeat !important;
background-position: center center !important;
}
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='${custom_scrollbar_arrows_color}' %3E%3Cpath d='m7.247 4.86-4.796 5.481c-.566.647-.106 1.659.753 1.659h9.592a1 1 0 0 0 .753-1.659l-4.796-5.48a1 1 0 0 0-1.506 0z'/%3E%3C/svg%3E ") !important;
}
scrollbar[orient="vertical"] scrollbarbutton[type="increment"] {
background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='${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;
}
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='${custom_scrollbar_arrows_color}' %3E%3Cpath d='m3.86 8.753 5.482 4.796c.646.566 1.658.106 1.658-.753V3.204a1 1 0 0 0-1.659-.753l-5.48 4.796a1 1 0 0 0 0 1.506z'/%3E%3C/svg%3E ") !important;
}
scrollbar[orient="horizontal"] scrollbarbutton[type="increment"] {
background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='${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;
}
`;
else if(custom_scrollbar_arrows === true && custom_scrollbar_arrows_version === 2)
custom_scrollbar_arrows_code=`
scrollbar scrollbarbutton {
background-repeat: no-repeat !important;
background-position: center center !important;
}
scrollbar[orient="vertical"] > scrollbarbutton[type="decrement"] {
background-image: url("${ProfilePathChrome}icons/up.svg") !important;
}
scrollbar[orient="vertical"] > scrollbarbutton[type="increment"] {
background-image: url("${ProfilePathChrome}icons/down.svg") !important;
}
scrollbar[orient="horizontal"] > scrollbarbutton[type="decrement"] {
background-image: url("${ProfilePathChrome}icons/left.svg") !important;
}
scrollbar[orient="horizontal"] > scrollbarbutton[type="increment"] {
background-image: url("${ProfilePathChrome}icons/right.svg") !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;
}
scrollbar[orient="vertical"] scrollbarbutton {
height: 14px !important;
width: 7px !important;
}
scrollbar[orient="horizontal"] scrollbarbutton {
height: 7px !important;
width: 14px !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);




})();