Examine source code of SyncFillr Autofill Forms

{
  "manifest_version": 3,
  "browser_specific_settings": {
    "gecko": {
      "id": "SyncFillr@addon.local",
      "strict_min_version": "120.0"
    }
  },
  "name": "SyncFillr Autofill Forms",
  "version": "1.0.1",
  "default_locale": "en",
  "description": "SyncFillr – Fast Form Autofill. Fill any form instantly with profiles and smart rules.",
  "homepage_url": "https://github.com/syncfillr",
  "icons": {
    "16": "images/icon16.png",
    "32": "images/icon32.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "action": {
    "default_icon": {
      "16": "images/icon16-off.png",
      "32": "images/icon32-off.png"
    },
    "default_popup": "popup.html",
    "default_title": "SyncFillr"
  },
  "background": {
    "scripts": [
      "js/background.js"
    ],
    "type": "module"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "js/content.js"
      ],
      "all_frames": true,
      "match_about_blank": true,
      "run_at": "document_end"
    }
  ],
  "options_page": "options.html",
  "sidebar_action": {
    "default_icon": {
      "16": "images/icon16.png",
      "32": "images/icon32.png"
    },
    "default_panel": "sidepanel.html",
    "default_title": "SyncFillr",
    "open_at_install": false
  },
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "default": "Alt+A"
      },
      "description": "Open SyncFillr popup"
    },
    "execute_active_profile": {
      "suggested_key": {
        "default": "Alt+F"
      },
      "description": "Execute the active profile"
    },
    "open_options": {
      "suggested_key": {
        "default": "Alt+O"
      },
      "description": "Open Options page"
    },
    "toggle_manual": {
      "suggested_key": {
        "default": "Alt+M"
      },
      "description": "Toggle manual mode"
    }
  },
  "host_permissions": [
    "<all_urls>"
  ],
  "permissions": [
    "activeTab",
    "contextMenus",
    "scripting",
    "storage",
    "tabs"
  ],
  "web_accessible_resources": [
    {
      "matches": [
        "<all_urls>"
      ],
      "resources": [
        "css/infobar.css",
        "images/icon32.png",
        "images/close.svg"
      ]
    }
  ]
}