saasrankedSoftware, ranked on the facts

web browser · Mozilla

Mozilla Firefox

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

80/100

#2 of 12 web browsers
Facts checked 8 Oct 2026

In short

Firefox suits people who want privacy features in the browser itself: tracker and fingerprint blocking, a free-tier browser VPN and sync Mozilla cannot read3,4,5,6. Its code is open source and Mozilla says it keeps Manifest V2 support13,16. The catch: Firefox's pages do not mention passkeys or Chrome Web Store installs, and a past Bugzilla breach is on record10,11,18.

Best for: People who want open-source code, tracker blocking and sync that Mozilla cannot read.

Where the points come from

Systems8 of 8
Privacy and security32 of 37
Sync and sign-in17 of 22
Extensions6 of 12
Tabs and tools12 of 16
Price5 of 5

Systems 8 of 8 points

RuleWhat is publishedPoints
Other systemsmacOS, Linux, iOS, AndroidDownload page lists Windows, macOS, iOS, Android and Linux12.8 / 8

Privacy and security 32 of 37 points

RuleWhat is publishedPoints
Blocks trackers by defaultYesFirefox blocks thousands of known trackers, and 2000+ ad trackers; Enhanced Tracking Protection needs no setup3,1.8 / 8
Built-in ad blockerNot publishedNot published on the vendor's feature pages, which describe ad tracker blocking only2,3.0 / 5
Fingerprinting protectionYesFirefox blocks known fingerprinters and adds broader protections for suspected fingerprinters4.7 / 7
Built-in VPN or proxyYesToolbar VPN routes browser traffic through a proxy; free up to 50 GB a month6.3 / 3
Open sourceYesMozilla says all its software is open source; Firefox binaries are under the MPL, and the source is on GitHub13,14.5 / 5
Public bug bountyYesMozilla runs a client bug bounty that covers Firefox and other Mozilla applications15.4 / 4
Phishing and malware warningsYesPrivacy notice says Firefox uses Google Safe Browsing against malicious downloads and phishing; it does not say 'by default'17.5 / 5

Sync and sign-in 17 of 22 points

RuleWhat is publishedPoints
Free sync across devicesYesSync keeps Firefox tabs, bookmarks, history, passwords, add-ons and preferences in step across devices; it needs a free Mozilla account19,5.6 / 6
End-to-end encrypted syncYesData 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 it5,19.8 / 8
Built-in password managerYesFirefox has a built-in password manager that stores and fills logins10.3 / 3
Saves passkeysNot publishedNot published on the vendor's password manager and feature pages10,2.0 / 5

Extensions 6 of 12 points

RuleWhat is publishedPoints
Chrome Web Store extensionsNot publishedNot published on the vendor's add-ons page, which names only the Firefox Add-ons store11.0 / 6
Manifest V2 extensions still workYesMozilla says Firefox keeps Manifest V2 alongside V3 and supports blocking webRequest16.6 / 6

Tabs and tools 12 of 16 points

RuleWhat is publishedPoints
Vertical tabsYesVertical tabs show tabs in a side panel that can be collapsed8.4 / 4
Tab groupsYesTab groups can be named, coloured and collapsed9.4 / 4
Built-in page translationYesFirefox translates whole pages; language models download to the browser and run locally7.4 / 4
Separate profilesNot publishedNot published on the vendor's feature pages2.0 / 4

Price 5 of 5 points

RuleWhat is publishedPoints
Cost to use$0Mozilla calls its software free software; download pages show no charge12,13.5 / 5

The rule behind each line: how we score web browsers.

Plans and prices

As the vendor lists them, before tax. Prices are in US dollars unless the plan shows euros; the points use US dollars, with euros converted at the ECB rate.

PlanPrice as listedPer monthNotes
Firefox1 personFree13$0Mozilla describes its software as open source and free software

Firefox download pages show no charge12.

Strengths

  • Sync is encrypted so that, Mozilla says, only you can read the data5.
  • Mozilla says all its software is open source, and Firefox binaries are made available under the MPL13.
  • Firefox blocks known fingerprinters and adds broader protection for suspected ones4.
  • Built-in translation downloads language models and translates locally7.
  • Vertical tabs and named, coloured, collapsible tab groups are built in8,9.

Limits

  • The built-in VPN is capped at up to 50 GB a month on the free tier6.
  • Firefox's feature pages do not say it can save passkeys10.
  • Firefox's add-ons page does not mention installing Chrome Web Store extensions11.
  • In 2015 Mozilla disclosed a compromised Bugzilla account that exposed 185 non-public bugs18.

Concerns on record

  • 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 Register18.

Other web browsers

  1. 1
    BravePeople who want privacy protections on from the first launch
    84/100
    $0cost to use
  2. 3
    Microsoft EdgeWindows users who want tracker blocking by default and Chrome extensions
    73/100
    Not publishedcost to use
  3. 4
    Google ChromePeople who want the Chrome Web Store and sync across Windows, Mac, Linux and phones
    66/100
    $0cost to use
  4. 5
    VivaldiPeople who want to customise their tabs, sidebar and layout
    65/100
    $0cost to use

Mozilla Firefox vs Brave · Mozilla Firefox vs Microsoft Edge · All 12 web browsers

Sources

  1. Firefox desktop browsers, Mozilla. Accessed 8 Oct 2026.
  2. Firefox features, Mozilla. Accessed 8 Oct 2026.
  3. Protection features, Mozilla. Accessed 8 Oct 2026.
  4. Fingerprint blocking, Mozilla. Accessed 8 Oct 2026.
  5. Firefox browser sync, Mozilla. Accessed 8 Oct 2026.
  6. Browser with built-in VPN, Mozilla. Accessed 8 Oct 2026.
  7. Translate the web, Mozilla. Accessed 8 Oct 2026.
  8. Vertical tabs, Mozilla. Accessed 8 Oct 2026.
  9. Tab groups, Mozilla. Accessed 8 Oct 2026.
  10. Free password manager, Mozilla. Accessed 8 Oct 2026.
  11. Firefox add-ons and browser extensions, Mozilla. Accessed 8 Oct 2026.
  12. Download Firefox, Mozilla. Accessed 8 Oct 2026.
  13. Mozilla licensing, Mozilla. Accessed 8 Oct 2026.
  14. mozilla-firefox/firefox, GitHub. Accessed 8 Oct 2026.
  15. Mozilla Security Bug Bounty Program, Mozilla. Accessed 8 Oct 2026.
  16. Firefox, Manifest V3 and ad blockers, Mozilla Blog. Accessed 8 Oct 2026.
  17. Firefox Privacy Notice, Mozilla. Accessed 8 Oct 2026.
  18. Mozilla says Bugzilla was hacked, The Register. Accessed 8 Oct 2026.
  19. Mozilla Accounts Privacy Notice, Mozilla. Accessed 8 Oct 2026.

Website: www.firefox.com · Markdown version · We are not affiliated with Mozilla.