Bug 1344748 - Skip recommended Marionette prefs for Firefox tests; r?maja_zf,whimboo The recommended Marionette preferences for use in automation are not so useful when testing the browser itself. Many of the tests for Firefox have highly specific requirements, and setting the recommended Marionette preferences could for these mean a deterioration of test coverage. The majority of test harnesses utilising Marionette use it to install unsigned add-ons at runtime, and these preferences are not relevant in this context. The preferences they use are defined in prefs_general.js. To avoid an unfortunate and unintended regression in test coverage, we skip using the recommended Marionette preferences when we test the browser itself. MozReview-Commit-ID: 5h3cGPfbicV

--- a/testing/profiles/prefs_general.js
+++ b/testing/profiles/prefs_general.js
@@ -360,8 +360,13 @@ user_pref("media.libavcodec.allow-obsole
 user_pref("media.openUnsupportedTypeWithExternalApp", false);
 
 // Disable password capture, so that mochitests that include forms aren't
 // influenced by the presence of the persistent doorhanger notification.
 user_pref("signon.rememberSignons", false);
 
 // Enable form autofill feature testing.
 user_pref("browser.formautofill.experimental", true);
+
+// Disable all recommended Marionette preferences for Gecko tests.
+// The prefs recommended by Marionette are typically geared towards
+// consumer automation; not vendor testing.
+user_pref("marionette.prefs.recommended", false);