1 files changed, 94 insertions, 0 deletions
diff --git a/toolkit/components/extensions/test/browser/browser_ext_thumbnails_bg_extension.js b/toolkit/components/extensions/test/browser/browser_ext_thumbnails_bg_extension.js
new file mode 100644
index 0000000000..96a2216067
--- /dev/null
+++ b/toolkit/components/extensions/test/browser/browser_ext_thumbnails_bg_extension.js
@@ -0,0 +1,94 @@
+"use strict";
+
+/* import-globals-from ../../../thumbnails/test/head.js */
+loadTestSubscript("../../../thumbnails/test/head.js");
+
+// The service that creates thumbnails of webpages in the background loads a
+// web page in the background (with several features disabled). Extensions
+// should be able to observe requests, but not run content scripts.
+add_task(async function test_thumbnails_background_visibility_to_extensions() {
+  const iframeUrl = "http://example.com/?iframe";
+  const testPageUrl = bgTestPageURL({ iframe: iframeUrl });
+  // ^ testPageUrl is http://mochi.test:8888/.../thumbnails_background.sjs?...
+
+  let extension = ExtensionTestUtils.loadExtension({
+    manifest: {
+      content_scripts: [
+        {
+          // ":8888" omitted due to bug 1362809.
+          matches: [
+            "http://mochi.test/*/thumbnails_background.sjs*",
+            "http://example.com/?iframe*",
+          ],
+          js: ["contentscript.js"],
+          run_at: "document_start",
+          all_frames: true,
+        },
+      ],
+      permissions: [
+        "webRequest",
+        "webRequestBlocking",
+        "http://example.com/*",
+        "http://mochi.test/*",
+      ],
+    },
+    files: {
+      "contentscript.js": () => {
+        // Content scripts are not expected to be run in the page of the
+        // thumbnail service, so this should never execute.
+        new Image().src = "http://example.com/?unexpected-content-script";
+        browser.test.fail("Content script ran in thumbs, unexpectedly.");
+      },
+    },
+    background() {
+      let requests = [];
+      browser.webRequest.onBeforeRequest.addListener(
+        ({ url, tabId, frameId, type }) => {
+          browser.test.assertEq(-1, tabId, "Thumb page is not a tab");
+          // We want to know if frameId is 0 or non-negative (or possibly -1).
+          if (type === "sub_frame") {
+            browser.test.assertTrue(frameId > 0, `frame ${frameId} for ${url}`);
+          } else {
+            browser.test.assertEq(0, frameId, `frameId for ${type} ${url}`);
+          }
+          requests.push({ type, url });
+        },
+        {
+          types: ["main_frame", "sub_frame", "image"],
+          urls: ["*://*/*"],
+        },
+        ["blocking"]
+      );
+      browser.test.onMessage.addListener(msg => {
+        browser.test.assertEq("get-results", msg, "expected message");
+        browser.test.sendMessage("webRequest-results", requests);
+      });
+    },
+  });
+
+  await extension.startup();
+
+  ok(!thumbnailExists(testPageUrl), "Thumbnail should not be cached yet.");
+
+  await bgCapture(testPageUrl);
+  ok(thumbnailExists(testPageUrl), "Thumbnail should be cached after capture");
+  removeThumbnail(testPageUrl);
+
+  extension.sendMessage("get-results");
+  Assert.deepEqual(
+    await extension.awaitMessage("webRequest-results"),
+    [
+      {
+        type: "main_frame",
+        url: testPageUrl,
+      },
+      {
+        type: "sub_frame",
+        url: iframeUrl,
+      },
+    ],
+    "Expected requests via webRequest"
+  );
+
+  await extension.unload();
+});