.travis.yml in patternfly-sass-3.6.0 vs .travis.yml in patternfly-sass-3.7.0

@@ -21,11 +21,11 @@
 after_script:
   - kill -2 $PID
   - sleep 2
 env:
   matrix:
-    - "TOLERANCE=0.000001"
-    - "TOLERANCE=0.000000"
+    - "BROWSER=firefox TOLERANCE=0.000001"
+    - "BROWSER=firefox TOLERANCE=0.000000"
 matrix:
   fast_finish: true
   allow_failures:
     - env: TOLERANCE=0.00
 notifications: