diff --git a/1-js/03-code-quality/01-debugging-chrome/article.md b/1-js/03-code-quality/01-debugging-chrome/article.md
index eb943486..2ca0d700 100644
--- a/1-js/03-code-quality/01-debugging-chrome/article.md
+++ b/1-js/03-code-quality/01-debugging-chrome/article.md
@@ -20,7 +20,7 @@ Here's what you should see if you are doing it for the first time:
 
 The toggler button <span class="devtools" style="background-position:-168px -76px"></span> opens the tab with files.
 
-Let's click it and select `index.html` and then `hello.js` in the tree view. Here's what should show up:
+Let's click it and select `hello.js` in the tree view. Here's what should show up:
 
 ![](chrome-tabs.png)
 
@@ -34,7 +34,7 @@ Now you could click the same toggler <span class="devtools" style="background-po
 
 ## Console
 
-If we press `Esc`, then a console opens below. We can type commands there and press `key:Enter` to execute.
+If we press `key:Esc`, then a console opens below. We can type commands there and press `key:Enter` to execute.
 
 After a statement is executed, its result is shown below.
 
diff --git a/3-frames-and-windows/01-popup-windows/article.md b/3-frames-and-windows/01-popup-windows/article.md
index 57c0c50d..05a46769 100644
--- a/3-frames-and-windows/01-popup-windows/article.md
+++ b/3-frames-and-windows/01-popup-windows/article.md
@@ -52,15 +52,11 @@ The difference is that Firefox treats a timeout of 2000ms or less are acceptable
 
 ## Modern usage
 
-As of now, we have many methods to load and show data on-page with JavaScript. But there are still situations when a popup works best.
+As of now, we have many methods to load and show data on-page with JavaScript. But there are still situations when a popup works good, because:
 
-For instance, many shops use online chats for consulting people. A visitor clicks on the button, it runs `window.open` and opens the popup with the chat.
-
-Why a popup is good here, why not in-page?
-
-1. A popup is a separate window with its own independent JavaScript environment. So a chat service doesn't need to integrate with scripts of the main shop site.
-2. A popup is very simple to attach to a site, little to no overhead. It's only a small button, without additional scripts.
-3. A popup may persist even if the user left the page. For example, a consult advices the user to visit the page of a new "Super-Cooler" goodie. The user goes there in the main window without leaving the chat.
+1. A popup is a separate window with its own independent JavaScript environment. So opening a popup with a third-party non-trusted site is safe.
+2. It's very easy to open a popup, little to no overhead. 
+3. A popup may persist even if the user left the page. In also can navigate (change URL) in the opener window.
 
 ## window.open
 
@@ -118,7 +114,7 @@ Most browsers show the example above as required.
 Rules for omitted settings:
 
 - If there is no 3rd argument in the `open` call, or it is empty, then the default window parameters are used.
-- If there is a string of params, but some yes/no features are omitted, then the omitted features are disabled, if the browser allows that. So if you specify params, make sure you explicitly set all required features to yes.
+- If there is a string of params, but some `yes/no` features are omitted, then the omitted features assumed to have `no` value. So if you specify params, make sure you explicitly set all required features to yes.
 - If there is no `left/top` in params, then the browser tries to open a new window near the last opened window.
 - If there is no `width/height`, then the new window will be the same size as the last opened.