Issue 6432 - Hide remove button for additional filter lists

js/desktop-options.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-present eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 219 matching lines @@
     }
 
     element.setAttribute("aria-label", title);
     if (this.details[i].searchable)
       element.setAttribute("data-search", title.toLowerCase());
     let controls = element.querySelectorAll(".control[role='checkbox']");
     for (let control of controls)
     {
       control.setAttribute("aria-checked", item.disabled == false);
       if (isAcceptableAds(item.url) && this == collections.filterLists)
+      {
         control.disabled = true;
+      }
+      else if (this == collections.filterLists)
+      {
+        // List preinstalled by administrators
+        getPref("additional_subscriptions", (additionalSubscriptions) =>
+        {
+          if (additionalSubscriptions.includes(item.url))
+            element.classList.add("non-removable");
+        });
+      }
     }
 
     let lastUpdateElement = element.querySelector(".last-update");
     if (lastUpdateElement)
     {
       let message = element.querySelector(".message");
       if (item.isDownloading)
       {
         let text = getMessage("options_filterList_lastDownload_inProgress");
         message.textContent = text;
@@ skipping 1214 matching lines @@
            "ui_warn_tracking"]
 });
 browser.runtime.sendMessage({
   type: "subscriptions.listen",
   filter: ["added", "disabled", "homepage", "lastDownload", "removed",
            "title", "downloadStatus", "downloading"]
 });
 
 window.addEventListener("DOMContentLoaded", onDOMLoaded, false);
 window.addEventListener("hashchange", onHashChange, false);