1 files changed, 32 insertions, 0 deletions
diff --git a/browser/extensions/webcompat/injections/js/bug1731825-office365-email-handling-prompt-autohide.js b/browser/extensions/webcompat/injections/js/bug1731825-office365-email-handling-prompt-autohide.js
new file mode 100644
index 0000000000..cf4ea63f40
--- /dev/null
+++ b/browser/extensions/webcompat/injections/js/bug1731825-office365-email-handling-prompt-autohide.js
@@ -0,0 +1,32 @@
+"use strict";
+
+/**
+ * Bug 1731825 - Office 365 email handling prompt autohide
+ *
+ * This site patch prevents the notification bar on Office 365
+ * apps from popping up on each page-load, offering to handle
+ * email with Outlook.
+ */
+
+/* globals exportFunction */
+
+const warning =
+  "Office 365 Outlook email handling prompt has been hidden. See https://bugzilla.mozilla.org/show_bug.cgi?id=1731825 for details.";
+
+const localStorageKey = "mailProtocolHandlerAlreadyOffered";
+
+const nav = navigator.wrappedJSObject;
+const { registerProtocolHandler } = nav;
+const { localStorage } = window.wrappedJSObject;
+
+Object.defineProperty(navigator.wrappedJSObject, "registerProtocolHandler", {
+  value: exportFunction(function(scheme, url, title) {
+    if (localStorage.getItem(localStorageKey)) {
+      console.info(warning);
+      return undefined;
+    }
+    registerProtocolHandler.call(nav, scheme, url, title);
+    localStorage.setItem(localStorageKey, true);
+    return undefined;
+  }, window),
+});