Examine source code of No Self Control

{
  "manifest_version": 2,
  "name": "No Self Control",
  "version": "1.1",
  "description": "A open-source extension for blocked sites and Pomodoro Timer!",
  "permissions": [
    "tabs",
    "storage",
    "notifications"
  ],
  "browser_action": {
    "default_popup": "browser_action/popup.html",
    "browser_style": true,
    "default_icon": {
      "16": "img/tomato16.png",
      "32": "img/tomato32.png",
      "48": "img/tomato48.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-script.js"
      ]
    }
  ],
  "options_ui": {
    "page": "options_ui/options.html",
    "open_in_tab": true
  }
}