Some web page requires authentication, they pop up a authentication window. During automation this pop up is a big problem, they can be avoided in firefox in just 3 steps.

Step 1: (Login to the site)

From Selenium or any automation script, call the site like http://username:password@site.com

eg., in selenium

selenium.open(“http://username:password@site.com");

Step 2: (Suppress the popup in firefox profile)

The above method will pop up an other ok button, to suppress that from firefox on your default profile open about:config and right click->New->Integer  use the preferred name as network.http.phishy-userpass-lengthnew and value as 255.

Step 3: (Use the firefox profile in Selenium)

java -jar selenium-server.jar -interactive -firefoxProfileTemplate “%USERPROFILE%\Application Data\Mozilla\Firefox\Profiles\k2h1lu68.default”

The file “k2h1lu68.default” could vary in your case.