The extension is called Facebook Container. This additional software can isolate your personal information in a special "container" of a new tab. This tab will then prevent and protect the user information to prevent outside parties from retrieving the data.
How this extension works, Facebook Container will limit access to your Facebook information. Suppose you are playing a game on a Facebook page in a browser. When you click on the link, it will open a new isolation tab.
As for you who want to share something from Facebook on other sites, then Firefox will also open it in a blue tab.
The analogy of how this extension works is, your data will be moved on a separate "container". That way your data and information will be hard to reach by third-party application providers who want to spy on.
"This extension helps control more web activity from Facebook by isolating this identity in a separate place," as Mozilla disclosed through its official blog.
Although installing this extension does not mean you will be completely secure. However, at least the Facebook Container will reduce the risk of data theft such as the recent case of Cambridge Analytica.
For those of you who want to install the extension is quite easy way. You just go to this page through Mozilla browser. Then you just press the "Add to Firefox" then automatically this extension will be installed.
If you install this extension under Facebook conditions, then Mozilla will automatically delete all cookies and then remove you from the Facebook page. After that you just go back through the new tab.
If the installation process of this extension is successful, when you open a Facebook page on the tab it will turn into a blue color at the bottom. This is one of Mozilla's efforts to prevent third parties stealing data of their browser users.