I have built and published 11 Firefox extensions on addons.mozilla.org. All are free, require no account, and store data locally. Here is a quick guide to all 11.
New Tab Replacements
These replace the Firefox new tab with a specific tool:
Weather and Clock Dashboard
Live weather and a clock. Set your location, see current temperature, conditions, and time on every new tab.
Install
Stock Market and Finance Dashboard
Your watchlist symbols with live prices. Enter your symbols (stocks, ETFs, indices, crypto) once; every new tab shows current price and day change.
Install
News Widget Dashboard
RSS feed reader on the new tab. Subscribe to any RSS feed; headlines appear in one place without opening individual sites.
Install
Daily Planner and To-Do List
Drag-and-drop task list. Add today's priorities; every new tab shows your task list.
Install
Habit Tracker New Tab
Monthly grid. Each row is a habit; each column is a day. Click to log completions.
Install
Speed Dial Hub
Visual grid of your most-used sites. Custom icons, organized groups.
Install
Quick Calculator and Unit Converter
Full calculator with unit conversion. Works offline.
Install
Browser-Wide Tools
These work across all browser tabs, not just the new tab:
NightOwl — Automatic Dark Mode
Applies dark mode to every website, auto-scheduled by your location's sunset and sunrise. No manual toggle.
Install
Voice Notes and Audio Recorder
One-click voice recorder in the toolbar. Click record, speak, download MP3. Local storage only.
Install
Tab Manager and Session Saver
Save and restore named sets of tabs. Context-switch between projects without keeping all tabs open.
Install
AI Writing Assistant
Grammar checking and text rewriting that runs locally. No text sent to external servers.
Install
Common thread
All 11:
- Published on Firefox Add-ons (addons.mozilla.org)
- Free — no subscriptions, no paid tiers
- No account required
- Local storage — data stays on your machine
- Reviewed by AMO
See the full series for detailed articles on each extension.
Top comments (0)