update ff version

mickmcgrath13 · mickmcgrath13 · commit f5603c5a4191 · 2016-11-01T14:14:07.000-05:00
diff --git a/.travis.yml b/.travis.yml
@@ -6,3 +6,5 @@ before_install:
   - "sh -e /etc/init.d/xvfb start"
 script: npm test
 sudo: false
+addons:
+  firefox: "49.0"
