Containers is an experimental feature that lets you separate your work, shoppingl or personal browsing without having to clear your history, log in and out, or use multiple browsers.

Container tabs are like normal tabs except sites you visit will have access to a separate slice of the browser's storage. This means your site preferences, logged in sessions, and advertising tracking data won't carry over to the new container. Likewise, any browsing you do within the new container will not affect your logged in sessions, or tracking data of your other containers.

What you can do with Containers

1. Log in to multiple accounts on a single website at the same time. For example, if you have a personal Gmail account and a work Gmail account, you can log in to both in separate containers.
2. Protect yourself against tracking without having to log out of websites while you browse. Websites in one container can't track your activity in other containers.
3. Protection against Web security attacks. Any harmful clicks will be kept within that websites container, so attackers won't be able to hijack your information in other containers.

How to enable Containers

Download Firefox Nightly, the experimental version of Firefox. Containers is enabled by default in version 50+ of Firefox Nightly. If you've turned it off, you can enable it by going to about:config and setting privacy.userContext.enabled to true.

How to use Containers

You can open new Container tabs and each one will keep separate browser storage (such as cookies or localStorage) from other Containers. Your normal tabs are the default container and will still look and act as you'd expect them to before enabling containers.

There are several ways to open new Container tabs:

File menu

In the Firefox menu bar, click File, followed by New Container Tab. From here you can choose from one of the four pre-defined containers: Home, Work, Banking, and Shopping. After choosing one of these, you will see a new tab from that container appear in the tab strip.

Menu button

1. In Firefox Nightly, click the menu button The image "new fx menu" does not exist. and then click Customize. From here, you'll find the Open Container Tab icon under the Additional Tools and Features section of the icons.

   

2. Drag this icon to your toolbar. Alternatively, you can place the icon in the dropdown. (See Customize Firefox controls, buttons and toolbars for more on customizing your menus).

Open links in new tabs and containers

You can open links in a new and/or different container. Right-click on any link, select Open link in New Container Tab, and then select the desired container tab.Hold the control keyCommand key while clicking a link to open it in a new tab. The new tab will open within the same container as the previous tab. This includes both the default container and in any of the predefined containers.