In order to have the ATOM search engine in your Firefox' Search Box, follow the next steps:

 

• Open Firefox.
• Download and install the following Add-On (If a yellow drop-down box appears, click on ALLOW): DOWNLOAD

 

 

• Restart Firefox. (Close & Re-Open, or click the "Restart Firefox" button on the Add-On window as Marked in Red)

 

• Choose the desired Atom theme on the Theme Homepage and Click on it.

 

• Right-Click on the Search bar, then click on "Add to Search Bar...". (Marked in Red)

 

• Type in "Atom | Search" on the "Name" field, then click "OK".

 

 

• Finished. You now have the most sleek and smart search engine on your Browser ! Don't forget to set Atom|Search as your homepage !