Disable FireFox tests (Refs: #273)

Author: johansmitsnl

.travis.yml

@@ -6,13 +6,11 @@ rvm:
   - ruby-head
 env:
   - DRIVER=google-chrome TZ=Europe/Berlin
-  - DRIVER=firefox TZ=Europe/Berlin MOZ_HEADLESS=1
 
 matrix:
     fast_finish: true
     allow_failures:
       - rvm: ruby-head
-      - env: DRIVER=firefox TZ=Europe/Berlin MOZ_HEADLESS=1
 before_install:
   - if [[ "$DRIVER" == "google-chrome" ]]; then wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | sudo apt-key add -; fi
   - if [[ "$DRIVER" == "google-chrome" ]]; then echo "deb http://dl.google.com/linux/chrome/deb/ stable main" | sudo tee /etc/apt/sources.list.d/google-chrome.list; fi