Examine source code of Big Search

{
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "default_locale": "en",
  "manifest_version": 3,
  "version": "3.7.1",
  "homepage_url": "https://garywill.github.io",
  "developer": {
    "name": "Garywill",
    "url": "https://github.com/garywill/BigSearch"
  },
  "permissions": [
    "search",
    "storage",
    "contextMenus",
    "clipboardWrite",
    "scripting"
  ],
  "host_permissions": [
    "*://*.acsearch.atwebpages.com/*",
    "*://garywill.github.io/*"
  ],
  "optional_permissions": [
    "clipboardRead",
    "activeTab",
    "*://*/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.acsearch.atwebpages.com/editengine.php*",
        "*://garywill.github.io/BigSearch/editengine.html*"
      ],
      "js": [
        "ck.js",
        "lzutf8.js",
        "js/contentscript_editgui.js",
        "i_ui.js",
        "enginesdata.js"
      ]
    }
  ],
  "icons": {
    "128": "icon.png"
  },
  "action": {
    "default_icon": "icon_button.png",
    "default_title": "__MSG_extensionName__",
    "default_popup": "home.html?showas=popup"
  },
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "default": "Ctrl+Alt+S"
      }
    },
    "_execute_sidebar_action": {
      "description": "Open sidebar"
    },
    "open_stab": {
      "description": "Open Big Search standalone tab"
    },
    "selection_as_search": {
      "description": "Set selected text as search term"
    },
    "selection_as_search_then_open_popup": {
      "description": "Set selected text as search term then open popup UI",
      "suggested_key": {
        "default": "Ctrl+Alt+D"
      }
    },
    "selection_as_search_then_open_sidebar": {
      "description": "Set selected text as search term then open sidebar"
    },
    "selection_as_search_then_open_stab": {
      "description": "Set selected text as search term then open Big Search standalone tab"
    }
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": false
  },
  "background": {
    "page": "background.html"
  },
  "sidebar_action": {
    "default_title": "__MSG_extensionName__",
    "default_panel": "sidebar_warn.html",
    "default_icon": "icon.png",
    "browser_style": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{45a03d78-2183-4d73-afe4-cfda260d1308}"
    }
  }
}