diff --git a/lib/browser/guest-view-manager.js b/lib/browser/guest-view-manager.js
index de11b03206bb..2f8ffefebc1c 100644
--- a/lib/browser/guest-view-manager.js
+++ b/lib/browser/guest-view-manager.js
@@ -193,7 +193,7 @@ const attachGuest = function (embedder, elementInstanceId, guestInstanceId, para
         // no value was specified, default it to true
         value = true
       }
-      webPreferences[name] = value
+      webPreferences[key] = value
     })
   }
 
diff --git a/lib/common/parse-features-string.js b/lib/common/parse-features-string.js
index da0381bbcf12..2c74c3463dc9 100644
--- a/lib/common/parse-features-string.js
+++ b/lib/common/parse-features-string.js
@@ -1,24 +1,19 @@
 // parses a feature string that has the format used in window.open()
 // - `str` input string
 // - `emit` function(key, value) - called for each parsed KV
-module.exports = function parseFeaturesString (str, emit) {
+module.exports = function parseFeaturesString (features, emit) {
   // split the string by ','
-  let i, len
-  let strTokens = params.str.split(/,\s*/)
-  for (i = 0, len = strTokens.length; i < len; i++) {
+  features.split(/,\s*/).forEach((feature) => {
     // expected form is either a key by itself (true boolean flag)
     // or a key/value, in the form of 'key=value'
     // split the tokens by '='
-    let kv = strTokens[i]
-    let kvTokens = kv.split(/\s*=/)
-    let key = kvTokens[0]
-    let value = kvTokens[1]
-    if (!key) continue
+    let [key, value] = feature.split(/\s*=/)
+    if (!key) return
 
-    // interpret the value as a boolean, if possible 
+    // interpret the value as a boolean, if possible
     value = (value === 'yes' || value === '1') ? true : (value === 'no' || value === '0') ? false : value
 
     // emit the parsed pair
     emit(key, value)
-  }
+  })
 }