Examine source code of Take a Breather

{
  "manifest_version": 2,
  "name": "Take a Breather",
  "version": "1.2resigned1",
  "description": "Take some time to yourself instead of mindlessly browsing.",
  "icons": {
    "48": "icons/border-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "take_a_breather.js"
      ],
      "css": [
        "take_a_breather.css"
      ]
    }
  ],
  "options_ui": {
    "page": "options.html"
  },
  "permissions": [
    "storage",
    "tabs",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Take a Breather",
    "default_icon": "icons/border-48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0f98f62b-0da8-4bcb-aa41-077010cf2f33}"
    }
  }
}