The Firefox Add-ons catalog has over 20,000 extensions. Most require an account, charge a subscription, or send your data to a server.
Here are 11 extensions that are genuinely free, need no account, and store data locally.
Productivity
Daily Planner and To-Do List — Drag-and-drop task list on the Firefox new tab. See your priorities every time you open a new tab. Local storage, no account.
Habit Tracker New Tab — Monthly habit grid. Click to log a daily check-in. Data stays on your machine.
Quick Calculator and Unit Converter — Full calculator with unit conversion on the new tab. Works offline.
Information at a glance
Weather and Clock Dashboard — Live weather and clock on the new tab. No weather app needed.
News Widget Dashboard — RSS headlines from sources you choose. No algorithmic curation.
Stock Market and Finance Dashboard — Live ticker for stocks, ETFs, and indices you set. No brokerage login.
Organization
Speed Dial Hub — Visual grid of your most-used sites. Custom icons, organized groups.
Tab Manager and Session Saver — Save and restore named sets of tabs. Context-switch without keeping all tabs open.
Communication and writing
Voice Notes and Audio Recorder — One-click voice recording in Firefox. Saves as MP3 locally.
AI Writing Assistant — Grammar checking and text rewriting that runs in Firefox, no cloud processing.
Display
NightOwl — Automatic dark mode that follows your location's sunset and sunrise. No manual toggle needed.
Common thread
All 11:
- Free (no subscription, no freemium gates)
- No account required
- Local storage — your data is not on any server
- Available on Firefox Add-ons (addons.mozilla.org)
For users who want to extend Firefox without creating accounts or paying subscriptions, this list covers most common productivity and information workflows.
These are 11 Firefox extensions I built — all open to review, all free. See the full series for more detail on each.
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