Examine source code of FC1extension

{
  "manifest_version": 2,
  "name": "FC1extension",
  "description": "Puts margins from FlipChat1 into a sortable table.",
  "version": "1.8resigned1",
  "content_scripts": [
    {
      "matches": [
        "https://www.flipchat1rs.com/forum/viewtopic.php?*"
      ],
      "js": [
        "jquery-3.1.1.min.js",
        "jquery.tablesorter.min.js",
        "content.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "style.css",
    "bg.gif",
    "asc.gif",
    "desc.gif"
  ],
  "browser_action": {
    "default_icon": "favicon.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "128": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{03cbb7f1-80a2-4802-b7ca-19583428d6e0}"
    }
  }
}