2 files changed, 52 insertions, 0 deletions
diff --git a/browser/extensions/webcompat/about-compat/aboutPage.js b/browser/extensions/webcompat/about-compat/aboutPage.js
new file mode 100644
index 0000000000..0f2e7c4ad4
--- /dev/null
+++ b/browser/extensions/webcompat/about-compat/aboutPage.js
@@ -0,0 +1,46 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+/* global ExtensionAPI, XPCOMUtils */
+
+const Services =
+  globalThis.Services ||
+  ChromeUtils.import("resource://gre/modules/Services.jsm").Services;
+
+XPCOMUtils.defineLazyServiceGetter(
+  this,
+  "resProto",
+  "@mozilla.org/network/protocol;1?name=resource",
+  "nsISubstitutingProtocolHandler"
+);
+
+const ResourceSubstitution = "webcompat";
+const ProcessScriptURL = "resource://webcompat/aboutPageProcessScript.js";
+const ContractID = "@mozilla.org/network/protocol/about;1?what=compat";
+
+this.aboutPage = class extends ExtensionAPI {
+  onStartup() {
+    const { rootURI } = this.extension;
+
+    resProto.setSubstitution(
+      ResourceSubstitution,
+      Services.io.newURI("about-compat/", null, rootURI)
+    );
+
+    if (!(ContractID in Cc)) {
+      Services.ppmm.loadProcessScript(ProcessScriptURL, true);
+      this.processScriptRegistered = true;
+    }
+  }
+
+  onShutdown() {
+    resProto.setSubstitution(ResourceSubstitution, null);
+
+    if (this.processScriptRegistered) {
+      Services.ppmm.removeDelayedProcessScript(ProcessScriptURL);
+    }
+  }
+};
diff --git a/browser/extensions/webcompat/about-compat/aboutPage.json b/browser/extensions/webcompat/about-compat/aboutPage.json
new file mode 100644
index 0000000000..42e6114188
--- /dev/null
+++ b/browser/extensions/webcompat/about-compat/aboutPage.json
@@ -0,0 +1,6 @@
+[
+  {
+    "namespace": "aboutCompat",
+    "description": "Enables the about:compat page"
+  }
+]