--- a/browser/base/content/test/general/head.js
+++ b/browser/base/content/test/general/head.js
@@ -623,18 +623,16 @@ function promiseTabLoadEvent(tab, url)
       info(`Skipping spurious load event for ${loadedUrl}`);
       return false;
     }
 
     info("Tab event received: load");
     return true;
   }
 
-  // Create two promises: one resolved from the content process when the page
-  // loads and one that is rejected if we take too long to load the url.
   let loaded = BrowserTestUtils.browserLoaded(tab.linkedBrowser, false, handle);
 
   if (url)
     BrowserTestUtils.loadURI(tab.linkedBrowser, url);
 
   return loaded;
 }
 

--- a/browser/base/content/test/plugins/head.js
+++ b/browser/base/content/test/plugins/head.js
@@ -85,18 +85,16 @@ function promiseTabLoadEvent(tab, url) {
       info(`Skipping spurious load event for ${loadedUrl}`);
       return false;
     }
 
     info("Tab event received: load");
     return true;
   }
 
-  // Create two promises: one resolved from the content process when the page
-  // loads and one that is rejected if we take too long to load the url.
   let loaded = BrowserTestUtils.browserLoaded(tab.linkedBrowser, false, handle);
 
   if (url)
     BrowserTestUtils.loadURI(tab.linkedBrowser, url);
 
   return loaded;
 }
 

--- a/browser/components/safebrowsing/content/test/head.js
+++ b/browser/components/safebrowsing/content/test/head.js
@@ -28,18 +28,16 @@ function promiseTabLoadEvent(tab, url, e
       info(`Skipping spurious load event for ${loadedUrl}`);
       return false;
     }
 
     info("Tab event received: load");
     return true;
   }
 
-  // Create two promises: one resolved from the content process when the page
-  // loads and one that is rejected if we take too long to load the url.
   let loaded;
   if (eventType === "load") {
     loaded = BrowserTestUtils.browserLoaded(tab.linkedBrowser, false, handle);
   } else {
     // No need to use handle.
     loaded =
       BrowserTestUtils.waitForContentEvent(tab.linkedBrowser, eventType,
                                            true, undefined, true);

--- a/browser/components/search/test/head.js
+++ b/browser/components/search/test/head.js
@@ -107,18 +107,16 @@ function promiseTabLoadEvent(tab, url)
       info(`Skipping spurious load event for ${loadedUrl}`);
       return false;
     }
 
     info("Tab event received: load");
     return true;
   }
 
-  // Create two promises: one resolved from the content process when the page
-  // loads and one that is rejected if we take too long to load the url.
   let loaded = BrowserTestUtils.browserLoaded(tab.linkedBrowser, false, handle);
 
   if (url)
     BrowserTestUtils.loadURI(tab.linkedBrowser, url);
 
   return loaded;
 }