Examine source code of Tweak New Twitter

{
  "manifest_version": 2,
  "default_locale": "en",
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "homepage_url": "https://github.com/insin/tweak-new-twitter/",
  "version": "2.99.0",
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "64": "icons/icon64.png",
    "96": "icons/icon96.png",
    "128": "icons/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://twitter.com/*",
        "https://mobile.twitter.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "tweak-new-twitter.user.js"
  ],
  "options_ui": {
    "browser_style": true,
    "chrome_style": false,
    "page": "options.html"
  },
  "browser_action": {
    "browser_style": true,
    "default_title": "__MSG_extensionName__",
    "default_popup": "browser_action.html"
  },
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{5cce4ab5-3d47-41b9-af5e-8203eea05245}"
    }
  }
}