Headless FF tests need to run with latest release FF

.travis.yml

@@ -75,7 +75,7 @@ matrix:
       rvm: 2.4.1
       env: CAPYBARA_FF=true HEADLESS=true
       addons:
-        firefox: latest-nightly
+        firefox: latest
   allow_failures:
     - gemfile: gemfiles/Gemfile.beta-versions
     - gemfile: gemfiles/Gemfile.edge-marionette

spec/selenium_spec_marionette.rb

@@ -25,7 +25,7 @@ Capybara.register_driver :selenium_marionette_clear_storage do |app|
   Capybara::Selenium::Driver.new(
     app,
     browser: :firefox,
-    desired_capabilities: {marionette: true, 'moz:webdriverClick': true},
+    desired_capabilities: {marionette: true},
     clear_local_storage: true,
     clear_session_storage: true,
     options: browser_options