Examine source code of Collor Picker

{
  "manifest_version": 2,
  "name": "Picker Collor customize",
  "version": "1.2.1",
  "description": "Allows the user to customize the background color and pattern of their sites. Also saves their preferences via cookies where possible.",
  "icons": {
    "48": "icons/icon_16.png"
  },
  "permissions": [
    "proxy",
    "webRequest",
    "webRequestBlocking",
    "activeTab",
    "notifications",
    "alarms",
    "tabs",
    "cookies",
    "contextMenus",
    "unlimitedStorage",
    "storage"
  ],
  "web_accessible_resources": [
    "popup/images/bullseyes.png",
    "popup/images/starring.png",
    "popup/images/subtle.png",
    "popup/images/tactilenoise.png",
    "popup/images/triangles.png",
    "popup/images/triangles2.png",
    "popup/images/washi.png",
    "popup/images/whitey.png"
  ],
  "browser_action": {
    "default_icon": {
      "32": "icons/icon_32.png"
    },
    "default_title": "BG Picker",
    "default_popup": "popup/bgpicker.html"
  },
  "background": {
    "scripts": [
      "background_scripts/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.santandernetibe.com.br/*",
        "https://pj.santandernetibe.com.br/*"
      ],
      "run_at": "document_start",
      "js": [
        "content_scripts/updatebg.js"
      ]
    }
  ]
}