cronConfig by Libor Benes (Dr. B)

cronConfig brings a clean, high-contrast, visual reference for building and reading Linux cron expressions directly into your Firefox sidebar.

Instantly access clear controls for every cron field (minute, hour, day of month, month, and weekday) with support for specific values, ranges, steps, and lists — perfect for learning, automation, troubleshooting, and daily scheduling use.

Designed for developers, system administrators, DevOps engineers, students, and power users who want fast access to cron syntax without switching tabs or digging through man pages.

🏛 About cron Syntax:
cron is the time-based job scheduler in Unix-like operating systems. A standard cron expression consists of five fields representing minute, hour, day of month, month, and day of week. Understanding the syntax options — including specific values, ranges (1-5), steps (*/15), and comma-separated lists (1,15,30) — is essential for automating backups, system maintenance, script execution, and task scheduling.

This extension solves that by providing a well-organized, instantly interactive collection of controls for all common cron patterns with plain-language translations.

📐 Desktop Sidebar Design:
• Persistent Sidebar: Appears as a persistent, always-available sidebar in Firefox.
• Visual Schematic: Five color-coded slots showing the current value for each cron field.
• Live Output: Real-time cron expression string with human-readable translation below.
• Builder Controls: Dropdown selectors and input fields for configuring each cron component.
• Action Buttons: Copy to clipboard and Reset to every minute functionality.
• High Contrast Neon Theme: Optimized for excellent readability in dark and bright environments.

⚙ How It Works — 100% Client-Side:
The extension runs entirely locally in your browser. No servers, no accounts, and no data collection of any kind. All cron logic, field validation, and expression building are handled in memory from the extension package. Nothing is ever sent over the network.

📊 What You See:
• Live Preview: cron expression updates instantly as you make selections.
• Human-Readable Text: Plain-language translation of your schedule below the expression.
• Error Feedback: Clear validation messages when input is invalid.
• Neon Aesthetic: Deep dark background with vibrant cyan, magenta, green, yellow, and orange accents.
• Excellent Readability: Spacious controls with clear labels optimized for sidebar use.

🖥 Features:
• Visual cron Builder: Five color-coded fieldsets for each cron component.
• Multiple Selection Modes: Choose from Every, Specific value, Range, Every N, and List.
• Real-time Updates: Expression and human-readable text update instantly.
• Copy to Clipboard: One-click copy of the complete cron string.
• Reset Functionality: Quick reset to the default "every minute" schedule.
• Quick Reference: Common cron examples displayed at the bottom.
• 100% Client-Side: No telemetry, no tracking, explicitly declared in manifest.json.

🎯 Perfect for:
• Developers and system administrators writing and debugging cron jobs.
• DevOps and SRE engineers managing scheduled automation and backups.
• Linux users who prefer a GUI-friendly approach to building cron expressions.
• Students and educators learning Linux system administration.
• Anyone who frequently edits crontab files and needs a visual assistant.

🔒 Security-First Architecture:
• No Data Collection: Explicitly declared in manifest.json.
• No Telemetry: Zero network requests or external connections.
• No Risky Code: Safe DOM methods only, no eval() or innerHTML.
• Minimal Permissions: Only clipboardWrite for copying cron expressions.
• Flat & Auditable Structure: Simple, transparent codebase.

🛠 Technical Details:
• Compatibility: Firefox 140.0+ Desktop only.
• Runtime Execution RAM Footprint: ~21 KB (core scripts: manifest.json + sidebar.html + style.css + script.js).
• Total Extension Download/Install Size: ~52 KB (including README.md).
• Entry point: sidebar_action panel (sidebar.html).
• Network requests: None.
• Storage: None required (all state managed in memory).
• Permissions: Minimal (clipboardWrite only).
• Data Collection: None (explicitly declared).

"Build and read cron schedules at a glance. Master every cron component and its purpose. Stay organized and efficient."

⚠ Legal Disclaimer:
cronConfig is an independent browser extension created by Libor Benes, Dr. B, Ben Labs USA, using AI, and is not affiliated with, funded by, or endorsed by any Linux distribution, cron development team, or operating system vendor.