How does Firefox in Linux combine the Address bar search bar

Used to the windows of Firefox and Chrome, did not expect the Linux address bar and the search bar is functionally separate. The address bar cannot be searched.

A lot of searching on the Internet. All said, should be in the about:config of Firefox to modify keyword. URL, but I don't have this option in my Firefox.

I created a new keyword. URL, found to be of no effect.

Originally, keyword. URLs have long been the practice of failure.

Now the right thing to do is:

Download an address bar Search bar plug-in

http://mozilla.com.cn/addon/69-omnibar/

After downloading, found that can use Ah, very happy ah.

Unfortunately, ... Firefox search engine options are not by Baidu .... Went to the Firefox store again to download the expansion of Baidu. This is the only way to use .....

How does Firefox in Linux combine the Address bar search bar