--- a/layout/tools/reftest/runreftest.py
+++ b/layout/tools/reftest/runreftest.py
@@ -74,16 +74,23 @@ class RefTest(object):
       prefsFile.write(part)
     prefsFile.close()
 
     # install the reftest extension bits into the profile
     self.automation.installExtension(os.path.join(SCRIPT_DIRECTORY, "reftest"),
                                                   profileDir,
                                                   "reftest@mozilla.org")
 
+    # I would prefer to use "--install-extension reftest/specialpowers", but that requires tight coordination with
+    # release engineering and landing on multiple branches at once.
+    if manifest.endswith('crashtests.list'):
+      self.automation.installExtension(os.path.join(SCRIPT_DIRECTORY, "specialpowers"),
+                                                    profileDir,
+                                                    "special-powers@mozilla.org")
+
   def buildBrowserEnv(self, options, profileDir):
     browserEnv = self.automation.environment(xrePath = options.xrePath)
     browserEnv["XPCOM_DEBUG_BREAK"] = "stack"
 
     for v in options.environment:
       ix = v.find("=")
       if ix <= 0:
         print "Error: syntax error in --setenv=" + v