---
title: Mozilla Firefox
canonical: https://saasranked.com/software/mozilla-firefox/
category: Web Browsers
points: 80
rank: 2 of 12
facts_checked: 2026-10-08
---

# Mozilla Firefox

Open-source browser on its own engine, with Total Cookie Protection, encrypted sync and a built-in browser VPN.

80 points out of 100. #2 of 12 web browsers. Vendor: Mozilla. Website: https://www.firefox.com/

- Sync data is encrypted on Mozilla's servers so Mozilla cannot read it; sync needs a free Mozilla account [5].
- Firefox blocks known trackers, with Total Cookie Protection keeping each site's cookies separate [3].
- The built-in browser VPN is a proxy, free for up to 50 GB a month [6].
- Mozilla says Firefox keeps Manifest V2 alongside V3, including the blocking webRequest API [16].
- Downloads exist for Windows, macOS, Linux, iOS and Android [12].

Verdict: Firefox suits people who want privacy features in the browser itself: tracker and fingerprint blocking, a free-tier browser VPN and sync Mozilla cannot read [3][4][5][6]. Its code is open source and Mozilla says it keeps Manifest V2 support [13][16]. The catch: Firefox's pages do not mention passkeys or Chrome Web Store installs, and a past Bugzilla breach is on record [10][11][18]. Best for: People who want open-source code, tracker blocking and sync that Mozilla cannot read.

## Points

| Criterion | Line | Value | Points | Note |
|---|---|---|---|---|
| Systems | Other systems | macOS, Linux, iOS, Android | 8/8 | Download page lists Windows, macOS, iOS, Android and Linux [12]. |
| Privacy and security | Blocks trackers by default | Yes | 8/8 | Firefox blocks thousands of known trackers, and 2000+ ad trackers; Enhanced Tracking Protection needs no setup [3][1]. |
| Privacy and security | Built-in ad blocker | Not published | 0/5 | Not published on the vendor's feature pages, which describe ad tracker blocking only [2][3]. |
| Privacy and security | Fingerprinting protection | Yes | 7/7 | Firefox blocks known fingerprinters and adds broader protections for suspected fingerprinters [4]. |
| Privacy and security | Built-in VPN or proxy | Yes | 3/3 | Toolbar VPN routes browser traffic through a proxy; free up to 50 GB a month [6]. |
| Privacy and security | Open source | Yes | 5/5 | Mozilla says all its software is open source; Firefox binaries are under the MPL, and the source is on GitHub [13][14]. |
| Privacy and security | Public bug bounty | Yes | 4/4 | Mozilla runs a client bug bounty that covers Firefox and other Mozilla applications [15]. |
| Privacy and security | Phishing and malware warnings | Yes | 5/5 | Privacy notice says Firefox uses Google Safe Browsing against malicious downloads and phishing; it does not say 'by default' [17]. |
| Sync and sign-in | Free sync across devices | Yes | 6/6 | Sync keeps Firefox tabs, bookmarks, history, passwords, add-ons and preferences in step across devices; it needs a free Mozilla account [19][5]. |
| Sync and sign-in | End-to-end encrypted sync | Yes | 8/8 | Data is encrypted on Mozilla's servers so Mozilla cannot read it; the accounts notice says synced data is encrypted before it leaves the browser and Mozilla cannot decrypt it [5][19]. |
| Sync and sign-in | Built-in password manager | Yes | 3/3 | Firefox has a built-in password manager that stores and fills logins [10]. |
| Sync and sign-in | Saves passkeys | Not published | 0/5 | Not published on the vendor's password manager and feature pages [10][2]. |
| Extensions | Chrome Web Store extensions | Not published | 0/6 | Not published on the vendor's add-ons page, which names only the Firefox Add-ons store [11]. |
| Extensions | Manifest V2 extensions still work | Yes | 6/6 | Mozilla says Firefox keeps Manifest V2 alongside V3 and supports blocking webRequest [16]. |
| Tabs and tools | Vertical tabs | Yes | 4/4 | Vertical tabs show tabs in a side panel that can be collapsed [8]. |
| Tabs and tools | Tab groups | Yes | 4/4 | Tab groups can be named, coloured and collapsed [9]. |
| Tabs and tools | Built-in page translation | Yes | 4/4 | Firefox translates whole pages; language models download to the browser and run locally [7]. |
| Tabs and tools | Separate profiles | Not published | 0/4 | Not published on the vendor's feature pages [2]. |
| Price | Cost to use | $0 | 5/5 | Mozilla calls its software free software; download pages show no charge [12][13]. |

## Plans

| Plan | Price | Per month (USD) |
|---|---|---|
| Firefox | Free [13] | $0 |

Firefox download pages show no charge [12].

## Strengths

- Sync is encrypted so that, Mozilla says, only you can read the data [5].
- Mozilla says all its software is open source, and Firefox binaries are made available under the MPL [13].
- Firefox blocks known fingerprinters and adds broader protection for suspected ones [4].
- Built-in translation downloads language models and translates locally [7].
- Vertical tabs and named, coloured, collapsible tab groups are built in [8][9].

## Limits

- The built-in VPN is capped at up to 50 GB a month on the free tier [6].
- Firefox's feature pages do not say it can save passkeys [10].
- Firefox's add-ons page does not mention installing Chrome Web Store extensions [11].
- In 2015 Mozilla disclosed a compromised Bugzilla account that exposed 185 non-public bugs [18].

## Concerns

- On 4 September 2015 Mozilla disclosed that a privileged account on Bugzilla had been compromised since at least September 2014, exposing 185 non-public bugs, as reported by The Register [18].

## Sources

1. [Firefox desktop browsers](https://www.firefox.com/en-US/browsers/desktop/), Mozilla, accessed 2026-10-08
2. [Firefox features](https://www.firefox.com/en-US/features/all/), Mozilla, accessed 2026-10-08
3. [Protection features](https://www.firefox.com/en-US/features/protection/), Mozilla, accessed 2026-10-08
4. [Fingerprint blocking](https://www.firefox.com/en-US/features/block-fingerprinting/), Mozilla, accessed 2026-10-08
5. [Firefox browser sync](https://www.firefox.com/en-US/features/sync/), Mozilla, accessed 2026-10-08
6. [Browser with built-in VPN](https://www.firefox.com/en-US/features/browser-with-built-in-vpn-secure-browsing/), Mozilla, accessed 2026-10-08
7. [Translate the web](https://www.firefox.com/en-US/features/translate/), Mozilla, accessed 2026-10-08
8. [Vertical tabs](https://www.firefox.com/en-US/features/vertical-tabs/), Mozilla, accessed 2026-10-08
9. [Tab groups](https://www.firefox.com/en-US/features/tab-groups/), Mozilla, accessed 2026-10-08
10. [Free password manager](https://www.firefox.com/en-US/features/password-manager/), Mozilla, accessed 2026-10-08
11. [Firefox add-ons and browser extensions](https://www.firefox.com/en-US/features/add-ons/), Mozilla, accessed 2026-10-08
12. [Download Firefox](https://www.firefox.com/en-US/download/all/), Mozilla, accessed 2026-10-08
13. [Mozilla licensing](https://www.mozilla.org/en-US/foundation/licensing/), Mozilla, accessed 2026-10-08
14. [mozilla-firefox/firefox](https://github.com/mozilla-firefox/firefox), GitHub, accessed 2026-10-08
15. [Mozilla Security Bug Bounty Program](https://www.mozilla.org/en-US/security/bug-bounty/), Mozilla, accessed 2026-10-08
16. [Firefox, Manifest V3 and ad blockers](https://blog.mozilla.org/en/firefox/firefox-manifest-v3-adblockers/), Mozilla Blog, accessed 2026-10-08
17. [Firefox Privacy Notice](https://www.mozilla.org/en-US/privacy/firefox/), Mozilla, accessed 2026-10-08
18. [Mozilla says Bugzilla was hacked](https://www.theregister.com/2015/09/04/mozilla_firefox_bugzilla_leak/), The Register, accessed 2026-10-08
19. [Mozilla Accounts Privacy Notice](https://www.mozilla.org/en-US/privacy/mozilla-accounts/), Mozilla, accessed 2026-10-08