Examine source code of Smileys4Koreus

{
  "manifest_version": 2,
  "name": "Smileys",
  "description": "Le dernier bataillon qui ne cédera pas au modernisme!",
  "version": "2.1.2resigned1",
  "icons": {
    "16": "icons/icon_16.png",
    "48": "icons/icon_48.png",
    "128": "icons/icon_128.png"
  },
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.koreus.com/*",
        "https://www.koreus.fr/*",
        "http://www.koreus.com/*",
        "http://www.koreus.fr/*"
      ],
      "js": [
        "content-script.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "img/smile.gif",
    "img/smile_2.gif",
    "img/sad.gif",
    "img/amazed.gif",
    "img/not_sure.gif",
    "img/thug.gif",
    "img/lol.gif",
    "img/gne.gif",
    "img/yey.gif",
    "img/oops.gif",
    "img/cry.gif",
    "img/evil.gif",
    "img/roll.gif",
    "img/smile_3.gif",
    "img/bizarre.gif",
    "img/gratte.gif",
    "img/coeur.gif",
    "img/hammer.gif",
    "img/lolhit.gif",
    "img/banane.gif"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{97ed5d1b-3335-4b65-ae9c-6ef88a1ac58a}"
    }
  }
}