Examine source code of Calm MetaFilter

{
  "manifest_version": 2,
  "name": "Calm MetaFilter",
  "description": "Encourages you to stop for a breath before you comment.",
  "version": "0.0.2resigned1",
  "author": "Emanuel Feld",
  "background": {
    "scripts": []
  },
  "options_ui": {
    "page": "options.html",
    "chrome_style": true
  },
  "web_accessible_resources": [
    "css/main.css",
    "js/main.js",
    "js/options.js",
    "options.html"
  ],
  "icons": {
    "16": "img/16.png",
    "48": "img/48.png",
    "128": "img/128.png"
  },
  "content_scripts": [
    {
      "css": [
        "css/main.css"
      ],
      "js": [
        "js/main.js"
      ],
      "matches": [
        "https://*.metafilter.com/*"
      ],
      "run_at": "document_end"
    }
  ],
  "permissions": [
    "https://*.metafilter.com/*",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{d97b2b4c-65bd-4448-a911-bfa027798e7c}"
    }
  }
}