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diff --git a/toolkit/mozapps/extensions/test/xpcshell/test_strictcompatibility.js b/toolkit/mozapps/extensions/test/xpcshell/test_strictcompatibility.js
new file mode 100644
index 0000000000..c33495f034
--- /dev/null
+++ b/toolkit/mozapps/extensions/test/xpcshell/test_strictcompatibility.js
@@ -0,0 +1,152 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Tests AddonManager.strictCompatibility and it's related preference,
+// extensions.strictCompatibility, and the strictCompatibility option in
+// install.rdf
+
+// turn on Cu.isInAutomation
+Services.prefs.setBoolPref(PREF_DISABLE_SECURITY, true);
+
+// The `compatbile` array defines which of the tests below the add-on
+// should be compatible in. It's pretty gross.
+const ADDONS = [
+  // Always compatible
+  {
+    manifest: {
+      id: "addon1@tests.mozilla.org",
+      targetApplications: [
+        {
+          id: "xpcshell@tests.mozilla.org",
+          minVersion: "1",
+          maxVersion: "1",
+        },
+      ],
+    },
+    compatible: {
+      nonStrict: true,
+      strict: true,
+    },
+  },
+
+  // Incompatible in strict compatibility mode
+  {
+    manifest: {
+      id: "addon2@tests.mozilla.org",
+      targetApplications: [
+        {
+          id: "xpcshell@tests.mozilla.org",
+          minVersion: "0.7",
+          maxVersion: "0.8",
+        },
+      ],
+    },
+    compatible: {
+      nonStrict: true,
+      strict: false,
+    },
+  },
+
+  // Opt-in to strict compatibility - always incompatible
+  {
+    manifest: {
+      id: "addon3@tests.mozilla.org",
+      strictCompatibility: true,
+      targetApplications: [
+        {
+          id: "xpcshell@tests.mozilla.org",
+          minVersion: "0.8",
+          maxVersion: "0.9",
+        },
+      ],
+    },
+    compatible: {
+      nonStrict: false,
+      strict: false,
+    },
+  },
+
+  // Addon from the future - would be marked as compatibile-by-default,
+  // but minVersion is higher than the app version
+  {
+    manifest: {
+      id: "addon4@tests.mozilla.org",
+      targetApplications: [
+        {
+          id: "xpcshell@tests.mozilla.org",
+          minVersion: "3",
+          maxVersion: "5",
+        },
+      ],
+    },
+    compatible: {
+      nonStrict: false,
+      strict: false,
+    },
+  },
+
+  // Dictionary - compatible even in strict compatibility mode
+  {
+    manifest: {
+      id: "addon5@tests.mozilla.org",
+      type: "dictionary",
+      targetApplications: [
+        {
+          id: "xpcshell@tests.mozilla.org",
+          minVersion: "0.8",
+          maxVersion: "0.9",
+        },
+      ],
+    },
+    compatible: {
+      nonStrict: true,
+      strict: true,
+    },
+  },
+];
+
+async function checkCompatStatus(strict, index) {
+  info(`Checking compat status for test ${index}\n`);
+
+  equal(AddonManager.strictCompatibility, strict);
+
+  for (let test of ADDONS) {
+    let { id } = test.manifest;
+    let addon = await promiseAddonByID(id);
+    checkAddon(id, addon, {
+      isCompatible: test.compatible[index],
+      appDisabled: !test.compatible[index],
+    });
+  }
+}
+
+add_task(async function setup() {
+  createAppInfo("xpcshell@tests.mozilla.org", "XPCShell", "1", "1.9.2");
+
+  for (let addon of ADDONS) {
+    let xpi = await createAddon(addon.manifest);
+    await manuallyInstall(
+      xpi,
+      AddonTestUtils.profileExtensions,
+      addon.manifest.id
+    );
+  }
+
+  await promiseStartupManager();
+});
+
+add_task(async function test_1() {
+  info("Test 1");
+  Services.prefs.setBoolPref(PREF_EM_STRICT_COMPATIBILITY, false);
+  await checkCompatStatus(false, "nonStrict");
+  await promiseRestartManager();
+  await checkCompatStatus(false, "nonStrict");
+});
+
+add_task(async function test_2() {
+  info("Test 2");
+  Services.prefs.setBoolPref(PREF_EM_STRICT_COMPATIBILITY, true);
+  await checkCompatStatus(true, "strict");
+  await promiseRestartManager();
+  await checkCompatStatus(true, "strict");
+});