Hide cast and browser default menu items in extension pages

ext/src/background/background.ts

@@ -226,6 +226,22 @@ async function initMenus () {
         }
     });
 
+    // Hide cast item on extension pages
+    browser.menus.onShown.addListener(info => {
+        if (info.pageUrl?.startsWith(browser.runtime.getURL(""))) {
+            browser.menus.update(menuIdCast, {
+                visible: false
+            });
+
+            browser.menus.refresh();
+        }
+    });
+    browser.menus.onHidden.addListener(() => {
+        browser.menus.update(menuIdCast, {
+            visible: true
+        });
+    });
+
     browser.menus.onShown.addListener(async info => {
         // Only rebuild menus if whitelist menu present
         // WebExt typings are broken again here, so ugly casting

ext/src/manifest.json

@@ -49,6 +49,7 @@
   , "permissions": [
         "history"
       , "menus"
+      , "menus.overrideContext"
       , "nativeMessaging"
       , "storage"
       , "tabs"

ext/src/ui/popup/index.tsx

@@ -361,3 +361,9 @@ window.addEventListener("load", () => {
         <PopupApp />
       , document.querySelector("#root"));
 });
+
+window.addEventListener("contextmenu", () => {
+    browser.menus.overrideContext({
+        showDefaults: false
+    });
+});