Stop wasting time typing the same test inputs over and over again.
If you're a frontend dev or QA engineer, you know the pain. You're testing a signup flow for the 30th time today, and you're still manually typing John, Doe, john.doe@test.com, +1 555... into every single field.
I got tired of it. So I built FormSpackle.
β‘ What is FormSpackle?
FormSpackle is a Firefox extension that fills any form on any website with one click, using realistic, randomized data.
It's not just a basic autofill β it actually understands your form. It reads labels, placeholders, field types, and even works with modern UI component libraries.
π What It Can Do
One-Click Fill
Click the extension icon, hit fill β done. The entire form is populated with realistic data in milliseconds.
Smart Field Detection
FormSpackle doesn't just blindly fill text boxes. It detects:
- Input types (text, email, phone, password, URL, etc.)
- Dropdowns, checkboxes, and radio buttons
- Date and time pickers
- Custom components from libraries like MUI, Ant Design, and more
Multi-Form Support
Got multiple forms on a page? You can choose to fill a specific form or all forms at once.
Fill Empty Only
Already filled in some fields? Use "Fill Empty Only" mode and FormSpackle will leave your existing data untouched.
Saved Profiles
Create and save your own data profiles β reuse them anytime across different projects or environments.
Built-in Field Inspector
Debug forms faster with the field inspector. Highlight detected fields and view what FormSpackle sees under the hood.
π¨βπ» Who Is It For?
- Frontend developers testing forms during development
- QA engineers running repetitive form validation tests
- Power users filling job applications, registrations, or surveys quickly
π Privacy First
No tracking. No external servers. No data leaves your browser.
Everything runs 100% locally. Your data stays yours.
π‘ Real Workflows It Speeds Up
- Testing signup & login flows repeatedly
- QA regression testing on form-heavy apps
- Filling job applications in bulk
- Debugging form validation logic
- Demoing forms to clients or stakeholders
π Try It Out
FormSpackle is available on the Firefox Add-ons store:
π Install FormSpackle on Firefox
It's free, lightweight, and takes 10 seconds to install.
π£ I'd Love Your Feedback
This is something I built to scratch my own itch as a developer. If you try it out, I'd love to hear:
- What workflows do you use it for?
- Any field types or edge cases it misses?
- Features you'd like to see next?
Drop a comment below or reach out β every bit of feedback helps make it better. π
Built with β€οΈ for developers who fill forms way too many times a day.
Top comments (0)