Mozilla Firefox
Mozilla Firefox: A mature, privacy-focused browser for everyday browsing across desktop and mobile. Ranked #3 of 145 in Web Browsers by our editors (9.1/10); pricing: Free plan; best for open-source privacy-conscious everyday browsing.
At a glance
- Editor score9.1 / 10
- PricingFree plan
- Best forOpen-source privacy-conscious everyday browsing
- Free planYes
- Paid fromFree
- Browser engineGecko
- Founded2004
- Facts checked21 Sep 2026
Where it wins
- Enhanced Tracking Protection and Total Cookie Protection
- Available on Windows, macOS, Linux, iOS and Android
- Syncs bookmarks, passwords, history and open tabs across devices
Where it doesn't
- Sync requires a Mozilla account
- Extensions and themes use Mozilla’s own add-on store
- No paid tier for additional browser features
Our verdict on Mozilla Firefox
Mozilla Firefox is a free, open-source web browser for desktop and mobile users who want everyday browsing with built-in privacy controls. It runs on Windows, macOS, Linux, iOS and Android, using Mozilla’s Gecko rendering engine. Core browsing tools include private browsing, Enhanced Tracking Protection, Total Cookie Protection, phishing and malware protection, bookmarks, tab groups, PDF editing, and extensions and themes through Mozilla Add-ons. Mozilla’s source code is published under open-source licenses including the Mozilla Public License.
Privacy is Firefox’s clearest focus. Enhanced Tracking Protection helps block trackers, while Total Cookie Protection isolates cookies to limit cross-site tracking. Private browsing adds a separate browsing mode, and phishing and malware protection addresses common browser security risks. The combination suits people who want privacy features integrated into a general-purpose browser rather than added through separate tools. Firefox also supports tabbed browsing, tab groups and bookmark management, so its scope extends beyond privacy controls.
For multi-device users, a Mozilla account can synchronize bookmarks, passwords, history and open tabs across supported devices. The browser also supports extensions and themes through Mozilla Add-ons, giving users a way to extend and personalize the experience. Firefox is distributed as free software, with no paid plan separating core capabilities from higher tiers. Choose it if open-source development, built-in tracking protection and broad desktop-and-mobile availability matter most. Consider another browser if your priorities depend on a different browser engine, a separate extension ecosystem, or paid-tier features rather than a single free offering.
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Mozilla Firefox pricing
Mozilla Firefox fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Supported platforms | Both |
| Browser engine | Gecko |
| Built-in ad blocking | Yes |
| Tracking protection | Standard |
| Extension support | Own_store |
| Cross-device sync | Yes |
| Open source | Yes |
| Deployment | Desktop, Mobile |
| Platforms | Windows, macOS, Linux, iOS, Android |
| Support | Community, Docs |
| Built for | Solo, Small business, Mid-market, Enterprise (editorial estimate) |
| Pricing | Free plan |
| Website | firefox.com |
| Facts checked | 21 Sep 2026 |
Alternatives to Mozilla Firefox
- Google ChromeA complete free browser with broad platform coverage, sync, extensions, and built-in security.9.3
- Microsoft EdgeA free, cross-platform browser suited to Microsoft users who want broad compatibility.9.2
- Brave BrowserA privacy-first Chromium browser with broad platform and extension compatibility.9.0
See all Mozilla Firefox alternatives →
Mozilla Firefox vs the competition
- Mozilla Firefox vs Google Chrome
- Mozilla Firefox vs Microsoft Edge
- Mozilla Firefox vs Brave Browser
- Mozilla Firefox vs Opera
- Mozilla Firefox vs Vivaldi
- Mozilla Firefox vs Safari
Compare Mozilla Firefox with any tool side by side →
Also Ranked In
Mozilla Firefox is ranked in 3 of our directories.
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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