Examine source code of Reddit Slideshow Spectacular!

{
  "manifest_version": 3,
  "name": "Reddit Slideshow Spectacular!",
  "description": "__MSG_extDescription__",
  "version": "1.4.2",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "96": "icon/96.png",
    "128": "icon/128.png"
  },
  "default_locale": "en",
  "homepage_url": "https://rio517.github.io/reddit-slideshow-spectacular/",
  "permissions": [
    "storage",
    "downloads"
  ],
  "host_permissions": [
    "https://old.reddit.com/*",
    "https://www.reddit.com/*",
    "https://i.redd.it/*",
    "https://preview.redd.it/*",
    "https://external-preview.redd.it/*",
    "https://v.redd.it/*",
    "https://api.redgifs.com/*",
    "https://media.redgifs.com/*",
    "https://imgur.com/*",
    "https://i.imgur.com/*",
    "https://*.streamable.com/*",
    "https://*.giphy.com/*"
  ],
  "action": {
    "default_title": "__MSG_actionTitle__",
    "default_icon": {
      "16": "icon/16.png",
      "32": "icon/32.png",
      "48": "icon/48.png",
      "128": "icon/128.png"
    }
  },
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "default": "Alt+Shift+S"
      },
      "description": "__MSG_actionTitle__"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "reddit-slideshow@knyflores.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "open_in_tab": false,
    "page": "options.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://old.reddit.com/*",
        "https://www.reddit.com/*"
      ],
      "js": [
        "content-scripts/content.js"
      ]
    }
  ]
}