| Index: chrome/content/ui/filters-subscriptionactions.js | 
| =================================================================== | 
| --- a/chrome/content/ui/filters-subscriptionactions.js | 
| +++ b/chrome/content/ui/filters-subscriptionactions.js | 
| @@ -49,7 +49,7 @@ | 
| let node = null; | 
| let tabIndex = -1; | 
| let subscriptions = filter.subscriptions.slice(); | 
| -    subscriptions.sort(function(s1, s2) s1.disabled - s2.disabled); | 
| +    subscriptions.sort((s1, s2) => s1.disabled - s2.disabled); | 
| for (let i = 0; i < subscriptions.length; i++) | 
| { | 
| let subscription = subscriptions[i]; | 
|  |