Change the new layout for the old one????

Hello. I want the old layout...If I use Firefox browser I get the old one, but If I use Opera browser I get the new one that honestly I hate, no offense to whoever spent time working into it but it's not good. How come when I enter with firefox ( browser I don't like to use ) I'm getting the old layout and if I use Opera ( the browser I want to use ) I get this new thing? I don't want to open firefox to ONLY use imdb.

Please consider going back on the changes, and let me know if there's something I can do to change it.

Thanks.