Examine source code of Reddit Stream

{
  "name": "Reddit Stream",
  "description": "Open reddit threads in reddit-stream",
  "manifest_version": 3,
  "version": "1.2.1",
  "icons": {
    "128": "icons/icon-128.png"
  },
  "action": {
    "default_title": "Open thread in reddit-stream"
  },
  "permissions": [
    "activeTab",
    "contextMenus"
  ],
  "background": {
    "scripts": [
      "background/scripts.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "reddit-stream@jellyfith"
    }
  },
  "page_action": {
    "default_title": "Open thread in reddit-stream",
    "default_icon": {
      "128": "icons/icon-128.png"
    },
    "show_matches": [
      "*://*.reddit.com/r/*/comments/*"
    ]
  }
}