Examine source code of Simple Highlighter

{
  "manifest_version": 2,
  "name": "Simple Highlighter",
  "description": "Tool for highlight web pages content and export it to markdown file.",
  "version": "0.5.1",
  "homepage_url": "https://github.com/kstopa/firefox-highlighter",
  "icons": {
    "48": "icons/highlighter-logo-48.png",
    "96": "icons/highlighter-logo-96.png",
    "128": "icons/highlighter-logo-128.png"
  },
  "permissions": [
    "tabs",
    "storage"
  ],
  "background": {
    "scripts": [
      "background-script.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-script.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": {
      "48": "icons/highlighter-logo-action-48.png",
      "96": "icons/highlighter-logo-96.png"
    },
    "default_title": "Save highlighted content",
    "default_popup": "popup/save-highlighted.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "highlighter@opendev.consulting"
    }
  }
}