Examine source code of PassFF

{
  "manifest_version": 2,
  "name": "PassFF",
  "version": "1.23",
  "description": "Integrates your zx2c4 password store into Firefox",
  "default_locale": "en",
  "icons": {
    "128": "icon.png"
  },
  "browser_action": {
    "browser_style": false,
    "default_icon": "skin/icon.svg",
    "theme_icons": [
      {
        "light": "skin/icon-light.svg",
        "dark": "skin/icon.svg",
        "size": 16
      },
      {
        "light": "skin/icon-light.svg",
        "dark": "skin/icon.svg",
        "size": 32
      }
    ],
    "default_popup": "content/menu.html"
  },
  "permissions": [
    "<all_urls>",
    "clipboardWrite",
    "contextMenus",
    "contextualIdentities",
    "nativeMessaging",
    "storage",
    "tabs",
    "webRequest",
    "webRequestBlocking"
  ],
  "options_ui": {
    "page": "content/preferences.html"
  },
  "background": {
    "scripts": [
      "modules/main.js"
    ],
    "type": "module"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_start",
      "js": [
        "content_script.js"
      ],
      "css": [
        "skin/content.css"
      ],
      "all_frames": true
    }
  ],
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Y"
      }
    }
  },
  "web_accessible_resources": [
    "skin/paper-plane.svg",
    "skin/pencil-square.svg",
    "skin/icon-light.svg",
    "icon.png"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "passff@invicem.pro",
      "strict_min_version": "60.0"
    }
  }
}