--- a/testing/marionette/driver.js
+++ b/testing/marionette/driver.js
@@ -150,17 +150,16 @@ this.GeckoDriver = function(appName, ser
     "browserVersion": Services.appinfo.version,
     "platformName": Services.sysinfo.getProperty("name").toLowerCase(),
     "platformVersion": Services.sysinfo.getProperty("version"),
     "acceptInsecureCerts": !this.secureTLS,
 
     // supported features
     "raisesAccessibilityExceptions": false,
     "rotatable": this.appName == "B2G",
-    "acceptSslCerts": false,
     "proxy": {},
 
     // proprietary extensions
     "specificationLevel": 0,
     "processId" : Services.appinfo.processID,
   };
 
   this.mm = globalMessageManager;