Examine source code of reblogr

{
  "manifest_version": 3,
  "name": "reblogr",
  "version": "0.4.1",
  "description": "Reblog reddit images to Tumblr",
  "browser_specific_settings": {
    "gecko": {
      "id": "reblogr@reblogr.example",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "permissions": [
    "contextMenus",
    "storage",
    "notifications",
    "activeTab",
    "scripting"
  ],
  "host_permissions": [
    "https://api.tumblr.com/*",
    "https://www.tumblr.com/*",
    "https://*.reddit.com/r/*/comments/*"
  ],
  "action": {
    "default_title": "Reblog to Tumblr",
    "default_icon": {
      "48": "icons/icon-48.png",
      "96": "icons/icon-96.png",
      "128": "icons/icon-128.png"
    },
    "default_popup": "picker.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.reddit.com/r/*/comments/*"
      ],
      "js": [
        "content/reddit-badges.js"
      ],
      "type": "module",
      "run_at": "document_idle"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "icons/icon-48.png"
      ],
      "matches": [
        "https://*.reddit.com/*"
      ]
    }
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  }
}