Examine source code of Minimap Scroller

{
  "description": "A minimap sidebar to scroll in web pages, similar to some video games and modern text editors.",
  "manifest_version": 2,
  "name": "Minimap Scroller",
  "version": "0.3.2resigned1",
  "homepage_url": "https://github.com/diox/firefox-minimap-scroller/",
  "permissions": [
    "<all_urls>",
    "tabs"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-scripts/base.js"
      ]
    }
  ],
  "sidebar_action": {
    "default_title": "Minimap",
    "default_panel": "sidebar/sidebar.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7e7eda8f-2e5d-4f43-86a9-07c6139e7a08}"
    }
  }
}