Use previous Firefox ESR, as new ESR is based on Firefox 52 (which requires Geckodriver)

OndraM · OndraM · commit f6ae7db59f4b · 2017-03-16T14:56:30.000Z
diff --git a/.travis.yml b/.travis.yml
@@ -12,7 +12,7 @@ matrix:
     - php: 7.0
       env: BROWSER_NAME="firefox"
       addons:
-        firefox: "latest-esr"
+        firefox: "45.8.0esr"
         apt:
           packages:
             - oracle-java8-installer
