For some of us whom use this game through facebook or Google Plus we have this problem of not being able to chat when we use full screen mode for the game, kabam encourages users to go to Kabam.com in order chat in full screen.
But ive found a way.
How do you put the game to maximum and still be able to use the chat feature
Download and install mozilla firefox if you dont have it already
Click on the orange firefox button (top left) and from the menu select addons
In the top right you will see a search facility (search all add ons) type in here "flash game maximizer"
Once installed which requires a restart of the browser, then repeat the above process to go back into your addons. You will see the flash game maximizer listed, click on options, a small window now appears.
put a tick in the following boxes, Automatic Parsing, Parse Nested Frames, Allways toggle Fullscreen, Window Resizing.
You can select quality to high if you wish.
Click on "ok" to finish.
Now navigate to your game,
Previously for using Google plus within browser google chrome, I log into my gmail and then navigate to google plus, then games then edgeworld. You may have a different way of doing this.
Once you get there make sure you have a status bar at the bottom of the browser.
Once you have your status bar showing, you should note a little "G" in the bottom right corner, click on this, and a window will appear showing two options, select the second option (2: Preloader) then click ok
The game will then reload and voila
One point to note is that at this time im not sure how to reload it, i think its a case of at the top right use the minimise button to go from fullscreen to normal and then click on the little "G" at the bottom right to reverse the process which will automatically reload the game into your normal viewing.