Examine source code of Fantasy-Highlighter

{
  "browser_action": {
    "default_popup": "menu.html"
  },
  "content_scripts": [
    {
      "js": [
        "scripts/content.js"
      ],
      "matches": [
        "https://*.reddit.com/r/baseball/*",
        "https://*.reddit.com/r/fantasybaseball/*",
        "https://*.reddit.com/r/nba/*",
        "https://*.reddit.com/r/fantasybball/*",
        "https://*.reddit.com/r/nfl/*",
        "https://*.reddit.com/r/fantasyfootball/*"
      ]
    }
  ],
  "description": "Highlights posts on sports-related subreddits.",
  "icons": {
    "16": "images/icon-16.png",
    "32": "images/icon-32.png",
    "48": "images/icon-48.png",
    "128": "images/icon-128.png"
  },
  "manifest_version": 2,
  "name": "Fantasy-Highlighter",
  "permissions": [
    "storage"
  ],
  "version": "1.1",
  "browser_specific_settings": {
    "gecko": {
      "id": "{9775302e-8dcc-4348-9df9-59142029b5d1}"
    }
  }
}