Detection mouse click on facebook like button (from chrome extension) -

i developing chrome extension show alert when user clicks on facebook button.

i'm using jquery purpose it's not working.

here code

$("button").click(function(){ alert("like"); }); 

i tried code, button inside iframe still no luck!

var abc = $(document).find('iframe:first').contents().find('html:first').find('body:first'); abc.find("button").click(function(){ alert("like"); }); 

manifest.json (i added permissions file)

"permissions": [     "tabs", "http://*/*", "https://*/*", "http://*.facebook.com/", "https://*.facebook.com/" ] 

any appreciated??

well first problem might fact in cases, 'like' <a> not button, $('button') not select it. detecting like link being clicked needed:

manifest.json

 "permissions": [    "tabs","*://*.facebook.com/*"  ],  "content_scripts": [{    "matches": ["*://*.facebook.com/*"],    "js": ["jquery.js","click.js"]  }] 

click.js

// of likes on things such comments , pictures , $('a.ufilikelink').click(function(){   console.log('like link clicked somewhere'); }); // 'button' can found on pages  $('input[value="like"]').click(function(){   console.log('like button clicked somewhere'); });