diff -r 000000000000 -r 6474c204b198 toolkit/mozapps/extensions/test/browser/browser_checkAddonCompatibility.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/mozapps/extensions/test/browser/browser_checkAddonCompatibility.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,34 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+// Test that all bundled add-ons are compatible.
+
+function test() {
+  waitForExplicitFinish();
+
+  Services.prefs.setBoolPref(PREF_STRICT_COMPAT, true);
+  ok(AddonManager.strictCompatibility, "Strict compatibility should be enabled");
+
+  AddonManager.getAllAddons(function gAACallback(aAddons) {
+    // Sort add-ons (by type and name) to improve output.
+    aAddons.sort(function compareTypeName(a, b) {
+      return a.type.localeCompare(b.type) || a.name.localeCompare(b.name);
+    });
+
+    let allCompatible = true;
+    for (let a of aAddons) {
+      // Ignore plugins.
+      if (a.type == "plugin")
+        continue;
+
+      ok(a.isCompatible, a.type + " " + a.name + " " + a.version + " should be compatible");
+      allCompatible = allCompatible && a.isCompatible;
+    }
+    // Add a reminder.
+    if (!allCompatible)
+      ok(false, "As this test failed, test browser_bug557956.js should have failed, too.");
+
+    finish();
+  });
+}