| Index: chrome/content/tests/subscriptionClasses.js | 
| diff --git a/chrome/content/tests/subscriptionClasses.js b/chrome/content/tests/subscriptionClasses.js | 
| index d5e08fd18eca25e9ee8a317c166d96b43ea77fc7..5d59f961f9f017e3e0c688860e5bcc2943038837 100644 | 
| --- a/chrome/content/tests/subscriptionClasses.js | 
| +++ b/chrome/content/tests/subscriptionClasses.js | 
| @@ -12,7 +12,7 @@ | 
| subscription.serialize(result); | 
| equal(result.sort().join("\n"), expected.sort().join("\n"), url); | 
|  | 
| -    let map = {__proto__: null}; | 
| +    let map = Object.create(null); | 
| for (let line of result.slice(1)) | 
| { | 
| if (/(.*?)=(.*)/.test(line)) | 
|  |