Examine source code of Based Highlighter

{
  "manifest_version": 2,
  "name": "Based Highlighter",
  "description": "Remember webpage highlights.",
  "version": "0.2",
  "homepage_url": "https://cashew.libertyit.com",
  "icons": {
    "48": "icon48.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "permissions": [
    "activeTab",
    "contextMenus",
    "storage",
    "tabs",
    "notifications"
  ],
  "browser_action": {
    "default_icon": "icon48.png",
    "default_area": "navbar",
    "default_title": "Based Highlighter"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "basedhighlighter.js"
      ],
      "all_frames": true
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "based@highlighter",
      "strict_min_version": "79.0"
    }
  }
}