diff --git a/.travis.yml b/.travis.yml
index 2419003755..07c048e6cd 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -14,7 +14,7 @@ before_script:
 script:
 - npm run generate-types
 - node ./node_modules/.bin/polymer test --npm --module-resolution=node -l chrome
-- node ./node_modules/.bin/polymer test --npm --module-resolution=node -l firefox
+- xvfb-run node ./node_modules/.bin/polymer test --npm --module-resolution=node -l firefox
 - if [ "${TRAVIS_PULL_REQUEST}" = "false" ]; then travis_wait 30 ./util/travis-sauce-test.sh; fi
 env:
   global:
diff --git a/wct.conf.json b/wct.conf.json
index 5b315d7362..8c061cea55 100644
--- a/wct.conf.json
+++ b/wct.conf.json
@@ -10,9 +10,6 @@
           "headless",
           "disable-gpu",
           "no-sandbox"
-        ],
-        "firefox": [
-          "-headless"
         ]
       }
     }