Examine source code of Promnesia

{
  "name": "Promnesia",
  "version": "1.4.2",
  "description": "Recall which pages you already visited, why and in which context",
  "permissions": [
    "storage",
    "webNavigation",
    "contextMenus",
    "notifications",
    "bookmarks",
    "history",
    "scripting"
  ],
  "commands": {
    "mark_visited": {
      "description": "Mark/unmark visited links on the current page",
      "suggested_key": {
        "default": "Ctrl+Alt+V",
        "mac": "Command+Alt+V"
      }
    },
    "search": {
      "description": "Open search page",
      "suggested_key": {
        "default": "Ctrl+Alt+H",
        "mac": "Command+Alt+H"
      }
    },
    "_execute_action": {
      "description": "Activate sidebar",
      "suggested_key": {
        "default": "Ctrl+Alt+E",
        "mac": "Command+Alt+E"
      }
    }
  },
  "optional_permissions": [],
  "manifest_version": 3,
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "icons": {
    "48": "images/ic_not_visited_48.png"
  },
  "options_ui": {
    "page": "options_page.html",
    "open_in_tab": true
  },
  "web_accessible_resources": [
    {
      "resources": [
        "sidebar.css",
        "*.js.map"
      ],
      "matches": [
        "*://*/*"
      ]
    }
  ],
  "action": {
    "default_icon": "images/ic_not_visited_48.png",
    "default_title": "Show promnesia sidebar",
    "default_area": "navbar"
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'"
  },
  "page_action": {
    "default_icon": {
      "48": "images/ic_visited_48.png"
    },
    "default_title": "Promnesia"
  },
  "host_permissions": [
    "file:///*",
    "http://*/*",
    "https://*/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{07c6b8e1-94f7-4bbf-8e91-26c0a8992ab5}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}