Pin to firefox 66 because of selenium error

aomarks · aomarks · commit f0fb532d0609 · 2019-06-06T09:42:56.000-07:00
diff --git a/.travis.yml b/.travis.yml
@@ -3,7 +3,7 @@ sudo: false
 dist: trusty
 node_js: '9'
 addons:
-  firefox: latest
+  firefox: "66.0"
   chrome: stable
 cache:
   directories:
