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Preview of FillKit for Firefox

FillKit for Firefox by Justin Dah-kenangnon

FillKit fills forms with realistic test data. Detects 150+ field types across 50+ locales. Valid and invalid modes for edge-case testing. Works offline — no data leaves the browser, unless opt in cloud features. For dev & QA . Open source, MIT

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Pin FillKit to your toolbar and click its icon on any page. Toggle it on/off or set a seed number for repeatable fills.Customize FillKit in the options page — override specific fields, set a default email domain, include/exclude selectors, and choose your locale for realistic names and addresses.Hide the main widget and a small FillKit icon appears at the bottom-right corner — click it to restore the widget anytime.Drag, hide, or reposition the widget. Use Alt+K to fill the current form, or switch to inline mode (Alt+I) to see a FillKit icon next to each field for one-click filling.FillKit detects forms on any web page — React, Angular, Vue, Django, PHP, or plain HTML. If the page has a form, FillKit fills it.
About this extension
FillKit reads page structure, labels, and surrounding context to detect what each field expects — then fills it with
realistic, coherent data. A checkout form gets a valid card number, matching expiry, and billing address in the same
city. A signup form gets a real-looking name, email, and strong password.

Key features:
  • 150+ field types — names, emails, phones, addresses, credit cards, dates, UUIDs, passwords, and more
  • 50+ locales — multilingual field detection and locale-appropriate generated data
  • Valid & invalid modes — generate correct data or intentionally broken values for edge-case testing
  • Keyboard shortcuts — Ctrl+Shift+K to fill all forms, Alt+K for current form, Alt+H to toggle widget
  • Fully offline — all processing happens locally, no data leaves your browser
  • Zero config — install and start filling. Customize locale, mode, and shortcuts from the options page

Built for developers, QA engineers, and demo environments. All generated data is synthetic — realistic but
entirely fake. FillKit is not intended for filling real forms with real personal information.

Open source under the MIT license: github.com/fillkit/in-browser

Powered by @fillkit/core — the same SDK available for programmatic use
in your tests and development workflows.
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Permissions and data

Required permissions:

  • Access your data for all web sites

Data collection:

  • The developer says this extension doesn't require data collection.
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More information
Version
1.0.0
Size
1.12 MB
Last updated
4 days ago (26 Mar 2026)
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