This will reveal a menu with lots of options. One of them will be named 'Settings'.
The Settings screen will now appear.
As you type in 'Cookies' (it's not case sensitive) you will see Chrome start to change what's shown on the settings page. It will reveal the 'Privacy' section and highlight two buttons with two yellow 'Cookies' callouts.
Click the 'Content settings...' button.
You are then taken directly to the Cookies setting.
You can now change your Cookies setting to what you prefer.
Typically (especially if you are already following this guide!) you want to enable cookies in Chrome by selecting the first option - 'Allow local data to be set (recommended)'. This will allow websites to store cookies (and other data!) on your computer for as long as the websites want to.
Click 'Done'.
In both Windows and OS X, the menu button will be in the top right-hand corner of Firefox.
If you're using Mac OS X, it will be called Preferences. If you are using Windows, it will be called Options.
The Settings screen will now appear.
You are then taken to the Privacy settings.
Firefox groups the Cookies settings under the concept of 'browser history'. In order to change your browser's cookies policy, you have to configure the browser history settings as well.
When you click on the 'Firefox will:' drop-down menu, you will see three choices. Select 'Use custom setting for history'
You now have the choice of enabling or disabling certain history features, including form history, browser history and most relevant: whether or not to Accept cookies from sites.
You also have some options regarding blocking third-party cookies if you want to configure that too.
You can also configure how long Firefox will keep the cookies it sets.
Once you have configured your preferences, you can simply close this tab and continue using Firefox.