As we all know Angry birds is out in Chrome is awesome to play when you want to take a break from hectic work 
. I tried some levels but was very curious to unlock other levels. Did a google search on this and got a java script which will help you to unlock all levels. Now if you are a die hard fan of Angry birds, try playing all levels without unlocking them 
. But if you can even lock all of them again with another script.
Unlock All Levels in Angry Birds
Open the game app and start the game, once it is loaded past the following java script in the address bar.
javascript: var i = 0; while (i<=69) { localStorage.setItem('level_star_'+i,'3'); i++; } window.location.reload();
and all the levels will be unlocked
In case you want to lock them back, use this code:
javascript: var i = 0; while (i<=69) { localStorage.setItem('level_star_'+i,'-1'); i++; } window.location.reload();
Have fun!!
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works fine…tested
Thanks