I've found a way to Full Screen the game since a lot of user likes this fuction, and in my opinion FS looks great at Full Screnshoot.
First you must download Maxthon Browser.
In my opinion is a very efficient browser for games, all games run perfectly for me in this browser.
1.- Full Screen mode: You can use this by pressing F11, you need to be already logged and playing the game (This has been only tested by logging via AMZ Site, Not sure if this work on facebook)
2.- Multi-Screen mode: This option allows you to watch 2 different tabs in 1 screen only by pressing F10, the right tool for people who have an alternative character.
3.- Screenshot Function: This browser has a Screenshot for those who don't know how to take them, you just need to press Ctrl+1 (By default, I think) and you will be able to select the area you want to be capture.
4.- Adblock + Others tools: It blocks most of the pop up and Advertise windows that some website drops, so could be confortable sometimes, and many more things.