Examine source code of Soul++

{
  "name": "Soul++",
  "description": "提升魂+论坛的使用体验 for Firefox",
  "version": "1.0.7",
  "manifest_version": 3,
  "content_scripts": [
    {
      "run_at": "document_start",
      "matches": [
        "https://*.spring-plus.net/*",
        "https://*.summer-plus.net/*",
        "https://*.soul-plus.net/*",
        "https://*.south-plus.net/*",
        "https://*.north-plus.net/*",
        "https://*.snow-plus.net/*",
        "https://*.level-plus.net/*",
        "https://*.white-plus.net/*",
        "https://*.imoutolove.me/*",
        "https://*.south-plus.org/*",
        "https://*.east-plus.net/*",
        "https://*.blue-plus.net/*",
        "https://spring-plus.net/*",
        "https://summer-plus.net/*",
        "https://soul-plus.net/*",
        "https://south-plus.net/*",
        "https://north-plus.net/*",
        "https://level-plus.net/*",
        "https://white-plus.net/*",
        "https://imoutolove.me/*",
        "https://south-plus.org/*",
        "https://snow-plus.net/*",
        "https://east-plus.net/*",
        "https://blue-plus.net/*"
      ],
      "js": [
        "js/content_script.js"
      ]
    }
  ],
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "64": "icon/64.png",
    "128": "icon/128.png"
  },
  "action": {
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "permissions": [
    "storage",
    "contextMenus",
    "tabs"
  ],
  "host_permissions": [
    "https://pan.baidu.com/*",
    "https://freeimage.host/"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{265dda91-b70d-4116-a6a6-568229098bc7}",
      "strict_min_version": "109.0"
    }
  }
}