Bye Bye Goolge Ads with FireFox

Step 1 : Open Firefox, Go to 'Help' menu at the top-left of the browser OR hit Alt + H
Help ⇒ Troubleshooting Information ⇒ Profile Folder: Show Folder
Note. This is your profile folder containing bookmarks etc, which you can copy and move to other PC's etc

Step 2 : Create a folder named chrome

Step 3 : Create a css file named userContent.css

Step 4 : Copy the following code to the files userContent.css

 @-moz-document domain(google.com.au) {  
    #taw {  
        display:none !important;  
    }  
    #rhs_block {  
        display:none !important;  
    }  
}   

Step 5 : Restart Firefox