Easily Remove Free-merchants.com Redirect from Firefox/Chrome/IE

Since yesterday, I noticed that all sites were automatically redirected to http://www.free-merchants.com/partner/promokod_aliexpress-by-alibabacom, clearly a BS spam site. How do I get rid of it?

What is Free-merchants.com?

Free-merchants.com is a spam site that is caused by the adware or ad-supported extensions which is compatible with browsers like Internet Explorer, Firefox and Google Chrome. This often happens after you have installed some software to your computer, because the adware or browser extension is often bundled to them.