Everytime I open up Firefox and Photoshop CS on my macbook and close them up via the X button at the top left corner of their windows, their windows close but my macbook still lags and shows my memory unchanged. I open Activity Monitor and the applications are still open using up to 1GB of RAM each. I have to click on each app and Quit (not Force Quit) them in order for the RAM to open up and be freed up. Why aren't these apps closing out automatically each time instead of being closed via Activity Monitor? These two apps take up a lot of RAM on my macbook.

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    You had two questions in here. This site works better when there is only one question per question. That way, it's easier for other people to find solutions if they have the same problem. I've edited out your second question, but feel free to ask it separately.
    – nohillside
    Apr 3 '15 at 13:46

Closing the last window of an application doesn't necessarily close the application.

For example, opening two TextEdit windows and then closing them both (kbd>Cmd-W or click the red close button top-left of window) will not close TextEdit. This allows one to click File>New (or Cmd-N) to open and work on a new TextEdit document.

You may be familiar with how Microsoft Windows manages applications. It actually opens a new instance of Firefox, for example, for each window that you open. On the Mac, that's not necessarily the case.

People who learn to use Microsoft Windows before learning the Mac are often confused at first because the Mac uses a different conceptual model. This is how Macs have always been, more or less.

Mac users get used to typing Cmd-Q if they want to completely quit an application. Often, this is not necessary. But if your machine doesn't have much RAM, you may notice memory hogs like browsers slowing things down.

  • The other guy's answer was more simpler and straight to the point but yours had more detail and more elaborate so I'll give it to you. Thanks!
    – Thomas
    Apr 4 '15 at 5:54

Clicking the close button (the red x in the window's title bar) will usually only close that window not the application.

Use command-Q to quit the application.

  • Great fast answer, simple, and straight to the point. But the other guy elaborated more. Would give you a +1 if I had enough reputation. Thanks for the fast reply though!
    – Thomas
    Apr 4 '15 at 5:56

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