Examine source code of SimpleBlock

{
  "manifest_version": 2,
  "name": "SimpleBlock",
  "version": "1.0.1",
  "description": "Add simple blocklists to help you focus",
  "icons": {
    "48": "icons/simpleblock-48.png"
  },
  "permissions": [
    "storage",
    "tabs",
    "webNavigation"
  ],
  "browser_action": {
    "default_icon": {
      "48": "icons/simpleblock-48.png"
    },
    "default_title": "SimpleBlock",
    "default_popup": "popup.html",
    "browser_style": true
  },
  "background": {
    "scripts": [
      "scripts/background.js"
    ]
  },
  "web_accessible_resources": [
    "redirect.html",
    "style.css",
    "scripts/launch_help.js",
    "lib/bootstrap.css",
    "lib/bootstrap.min.js"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{2e283951-3d90-4e5a-8cd5-ad6c73455d19}"
    }
  }
}