body{
    background-image: url("./content/site_data/bg.jpg");
    background-size: cover;
    background-repeat: no-repeat;
    font-family: 'Lobster', cursive;
}

Check: http://demo.jayantbhawal.in on firefox browsers, NOT in widescreen mode.

The code works on Chrome(Android + PC) and even the stock Android browser, but NOT Firefox(Android + PC). Is there any good alternative to it? Why is it not working anyways? Googled this issue a lot of times, but no one else seems to have this problem. Is it just me? In any case, how do I fix it? There are quite some questions on SO about it too, but none of them provide a legitimate solution, so can someone just tell me if they have background-size: cover; issues on firefox too?

So basically tell me 3 things: 1. Why is it happening? 2. What is a good alternative to it? 3. Is this happening to you too? On Firefox browsers of course.

Chrome Version 35.0.1916.114 m Firefox Version 29.0.1

Note: I may already be trying to fix it so at times you may see a totally weird page. Wait a bit and reload.