Gonna filter by platform inside the /r/RocketLeagueExchange in Anything-Goes Thread
At /r/RocketLeagueExchange/ (Reddit) we have a daily thread used to trade items from Rocket League for anything (things outside from the game) but every platform uses the same thread...
Choose the platform you want to use to filter and it gonna be saved.
When you press to load a new page this new page comes filtered too.
Updates on fly, change the platform and the page gonna be updated without refresh.
IF YOU LOAD A NEW PAGE AND NOTHING SHOW, PRESS TO LOAD AGAIN BECAUSE EVERYTHING LOADED WAS FILTERED AND THE EXTENSION DO NOT AUTO LOAD A NEW PAGE.