I was playing liberators on Facebook, last 3 days it stays frozen on opening page.
According to the developer's instructions, this is that it says when the game is frozen on the Loading screen regardless if it's played on the official website or on the Facebook platform.
Taken from the Support page at the official website: In most web browsers, you can clear your browser’s cache by pressing Ctrl+Shift+Delete (Windows) or Command+Shift+Delete (Mac).