(JS) update scripts for recent patches.

these scripts add new menuitems that open items in special tabs.
I implemented one of them in bug 1779335,
so that part of the script is now redundant and has been removed.
as for opening in unloaded tabs, the grammar has changed in bug 1779349
from "open in a new x" to "open in new x"
so I've updated the strings in these scripts to match.
(addon) update invert element addon.
(CSS) changes to focus ring related styles.
change how popup notification content is laid out.
update some messaging system styles (feature popups etc).
update sidebar styles slightly.

Author: aminomancer

JS/openBookmarkInContainerTab.uc.js

@@ -1,6 +1,6 @@
 // ==UserScript==
 // @name           Open Bookmark in Container Tab (context menu)
-// @version        1.2.1
+// @version        1.2.2
 // @author         aminomancer
 // @homepage       https://github.com/aminomancer/uc.css.js
 // @description    Adds a new menu to context menus prompted by right-clicking
@@ -27,8 +27,6 @@ class OpenPlacesInContainerTabMenu {
     l10n: {
       // Appears when right-clicking a container/folder in bookmarks or history.
       openAll: `Open All in Container Tabs`,
-      // Appears when right-clicking a tab in the synced tabs sidebar.
-      openSyncedTab: `Open in a New Container Tab`,
       // All of the menu items use a predefined access key. Access keys are
       // underlined in the menu item's label, and pressing them on your keyboard
       // automatically selects the menu item. They serve as hotkeys while the
@@ -39,7 +37,7 @@ class OpenPlacesInContainerTabMenu {
       // though. If the chosen access key is not present in the menu item's
       // label, instead of being underlined in the label, it will be shown after
       // the label in parentheses, e.g. "Open All in Container Tabs (G)"
-      accessKey: `c`,
+      accessKey: `i`,
     },
   };
   constructor() {
@@ -100,20 +98,6 @@ class OpenPlacesInContainerTabMenu {
       );
       popups.push(syncedOpenAllPopup);
 
-      this.syncedMenuOpenInContainer = this.create(document, "menu", {
-        id: "syncedTabsOpenInContainer",
-        label: l10n.openSyncedTab,
-        accesskey: l10n.accessKey,
-        disabled: true,
-        hidden: true,
-      });
-      this.syncedMenuOpenTab.after(this.syncedMenuOpenInContainer);
-      let syncedOpenPopup = this.syncedMenuOpenInContainer.appendChild(
-        document.createXULElement("menupopup")
-      );
-      syncedOpenPopup.addEventListener("command", e => this.openSyncedTab(e, syncedOpenPopup));
-      popups.push(syncedOpenPopup);
-
       this.syncedContextMenu.addEventListener("popupshowing", this);
       this.syncedFilterContextMenu.addEventListener("popupshowing", this, { once: true });
     }
@@ -200,14 +184,6 @@ class OpenPlacesInContainerTabMenu {
       (this._syncedMenuOpenAll = this.syncedContextMenu.querySelector("#syncedTabsOpenAllInTabs"))
     );
   }
-  get syncedMenuOpenTab() {
-    return (
-      this._syncedMenuOpenTab ||
-      (this._syncedMenuOpenTab = this.syncedContextMenu.querySelector(
-        "#syncedTabsOpenSelectedInTab"
-      ))
-    );
-  }
   get syncedMenuCopy() {
     return (
       this._syncedMenuCopy ||
@@ -257,8 +233,6 @@ class OpenPlacesInContainerTabMenu {
     this.syncedContextMenuInited = true;
     this.syncedMenuOpenAllInContainer.disabled = this.syncedMenuOpenAll?.disabled;
     this.syncedMenuOpenAllInContainer.hidden = this.syncedMenuOpenAll?.hidden;
-    this.syncedMenuOpenInContainer.disabled = this.syncedMenuOpenTab?.disabled;
-    this.syncedMenuOpenInContainer.hidden = this.syncedMenuOpenTab?.hidden;
   }
   openLinkInContainer(e, popup, item) {
     let win = window.gBrowser ? window : BrowserWindowTracker.getTopWindow();
@@ -309,11 +283,6 @@ class OpenPlacesInContainerTabMenu {
     } else items = folder;
     this.openLinkInContainer(e, popup, items);
   }
-  openSyncedTab(e, popup) {
-    if (!this.syncedContextMenuInited) return;
-    if (popup.triggerNode?.closest(".tabs-container"))
-      this.openLinkInContainer(e, popup, this.selectedSyncedTab);
-  }
   openAllSyncedFromDevice(e, popup) {
     if (!this.syncedContextMenuInited) return;
     if (popup.triggerNode?.closest(".tabs-container"))
@@ -327,6 +296,7 @@ class OpenPlacesInContainerTabMenu {
     sss.loadAndRegisterSheet(uri, sss.AUTHOR_SHEET);
   }
 }
+
 if (
   location.href !== `chrome://browser/content/browser.xhtml` ||
   gBrowserInit.delayedStartupFinished