Browser tools built for everyday workflows
ePlus.DEV creates practical, open-source browser extensions that reduce repetitive work and keep useful controls close to the page where you need them. This documentation covers three extensions: Gmail Alias Toolkit for generating and organizing Gmail aliases, Google Cloud Skills Boost Helper for tracking learning progress and accessing useful lab tools, and Sandbox Pay for testing PayPal Sandbox and Stripe card-payment scenarios.These projects are independent community tools maintained by ePlus.DEV. Gmail Alias Toolkit and Google Cloud Skills Boost Helper are not affiliated with or endorsed by Google. Sandbox Pay is not affiliated with PayPal or Stripe and is intended only for sandbox and development use.
Explore the extensions
Gmail Alias Toolkit
Generate
+tag aliases, dot variations, random addresses, and reusable presets. Keep account-specific history, favorites, statistics, exports, QR codes, and an optional inline helper beside email fields.Google Cloud Skills Boost Helper
Track public Skills Boost profiles, estimate Arcade points, manage multiple learners, review milestones, and open solution or search actions from supported lab pages.
Sandbox Pay
Generate PayPal Sandbox cards, select Stripe success, decline, and 3DS scenarios, trigger PayPal errors, and fill supported test payment forms from a browser sidebar.
Which extension should you use?
Designed around useful defaults
Open source
Review the implementation, releases, issues, and contribution history directly on GitHub.
Privacy-aware
Browser-local data is clearly separated from features that need public profiles, remote configuration, solution services, or external search providers.
Multilingual
Documentation for all three extensions is available across the 12 language trees. Sandbox Pay currently provides an English and Vietnamese extension interface.
Continuously maintained
Installation links point to official stores, release pages, or current source-build instructions instead of relying on hard-coded package files.
Get started
Install Gmail Alias Toolkit
Choose Chrome Web Store, Firefox Add-ons, a GitHub release package, or a source build.
Install Skills Boost Helper
Install from a supported browser store or load a package for development and testing.
Install Sandbox Pay
Install from Chrome Web Store or Firefox Add-ons, or build it from source for development.
Gmail Alias Toolkit source
View source code, releases, issues, and contribution guidance.
Skills Boost Helper source
View source code, releases, issues, and contribution guidance.
Sandbox Pay source
View source code, releases, issues, and current development status.