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Head-to-head · Web Browsers

Mozilla Firefox vs Avast Secure Browser

  • Updated Oct 2026
  • Both researched from official sources
  • 4 checks side by side
Higher score Mozilla Firefox #3 in Web Browsers 9.1/10 Free plan Free plan✓ 3 of 3 features Visit Firefox
Avast Secure Browser #16 in Web Browsers 7.6/10 Free plan · 30-day trial Free planFree trial✓ 2 of 3 features Visit Avast

Mozilla Firefox leads on 0 checks, Avast Secure Browser on 0, and 4 are even. Who comes out ahead on the 4 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreMozilla Firefox · 9.1/10
  • Free planboth
  • Free trialonly Avast Secure Browser
  • Most featuresMozilla Firefox · 3 of 3

Mozilla Firefox scores higher on our rubric for web browsers: 9.1 against 7.6 out of 10; our editors rank them #3 and #16.

On browser engine, Mozilla Firefox gives you Gecko where Avast Secure Browser offers Chromium. On extension support, Mozilla Firefox gives you Own_store where Avast Secure Browser offers Chrome_store.

Mozilla Firefox is the better fit for open-source privacy-conscious everyday browsing. Avast Secure Browser is the better fit for users wanting banking and security protections.

  • Mozilla Firefox fits best

    Open-source privacy-conscious everyday browsing

  • Avast Secure Browser fits best

    Users wanting banking and security protections

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Side by side

Feature Mozilla Firefox 9.1/10 Visit ↗ Avast Secure Browser 7.6/10 Visit ↗
At a glance
Editor score 9.1 7.6
Ranking #3 in Web Browsers #16 in Web Browsers
Best for Open-source privacy-conscious everyday browsing Users wanting banking and security protections
Pricing model Free Free plan + paid
Starting price Free plan $49.99/yr
Free plan ✓ ✓
Free trial — 30 days
Deployment Desktop, Mobile Desktop, Mobile
Platforms Windows, macOS, Linux, iOS, Android Windows, macOS, iOS, Android
Support Community, Docs Docs, Community
Built for Solo, Small business, Mid-market, Enterprise Solo, Small business
Features Mozilla Firefox 3/3 · Avast Secure Browser 2/3
Built-in ad blocking ✓ ✓
Cross-device sync ✓ ✓
Open source ✓ (best) Not checked yet
Specs
Supported platforms Both Both
Browser engine Gecko Chromium
Tracking protection Standard Not checked yet
Extension support Own_store Chrome_store
Our review
Pros
  • Enhanced Tracking Protection and Total Cookie Protection
  • Available on Windows, macOS, Linux, iOS and Android
  • Syncs bookmarks, passwords, history and open tabs across devices
  • Bank Mode supports encrypted banking and shopping sessions.
  • Web Shield blocks malicious and phishing websites and unsafe downloads.
  • Free apps cover Windows, macOS, Android, and iOS.
Cons
  • Sync requires a Mozilla account
  • Extensions and themes use Mozilla’s own add-on store
  • No paid tier for additional browser features
  • The built-in VPN is available only in PRO.
  • Automatic blocking of all ads and trackers requires PRO.
  • Extension support is focused on Chrome Web Store add-ons.
Our verdict

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…

Read the review →

Avast Secure Browser is a free web browser for Windows, macOS, Android, and iOS, aimed at people who want browsing privacy and security tools in one application. Its feature set includes Privacy Guard, ad and tracker blocking, Web Shield,…

Read the review →
  1. Mozilla FirefoxWeb Browsers 9.1Free plan
  2. Avast Secure BrowserWeb Browsers 7.6Free plan · 30-day trial

Strengths and trade-offs

  • Mozilla Firefox — 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

  • Avast Secure Browser — where it wins

    • Bank Mode supports encrypted banking and shopping sessions.
    • Web Shield blocks malicious and phishing websites and unsafe downloads.
    • Free apps cover Windows, macOS, Android, and iOS.

    Where it doesn't

    • The built-in VPN is available only in PRO.
    • Automatic blocking of all ads and trackers requires PRO.
    • Extension support is focused on Chrome Web Store add-ons.
  • Mozilla Firefox9.1/10 · Free plan

    A mature, privacy-focused browser for everyday browsing across desktop and mobile.

    Visit FirefoxFull verdict →
  • Avast Secure Browser7.6/10 · Free plan · 30-day trial

    A free, security-focused browser with banking protection and an optional VPN.

    Visit AvastFull verdict →

More comparisons

All web browsers comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update