--- a/testing/marionette/driver.js
+++ b/testing/marionette/driver.js
@@ -148,17 +148,16 @@ 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,
     "takesElementScreenshot": true,
     "takesScreenshot": true,
     "proxy": {},
 
     // Selenium 2 compat
     "platform": Services.sysinfo.getProperty("name").toUpperCase(),
 
     // proprietary extensions