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Head-to-head · Web Browsers

Mozilla Firefox vs Vivaldi

  • 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
Vivaldi #6 in Web Browsers 8.8/10 Free plan Free plan✓ 2 of 3 features Visit Vivaldi

Mozilla Firefox leads on 1 check, Vivaldi on 0, and 3 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
  • Most featuresMozilla Firefox · 3 of 3

Mozilla Firefox scores higher on our rubric for web browsers: 9.1 against 8.8 out of 10; our editors rank them #3 and #6.

On browser engine, Mozilla Firefox gives you Gecko where Vivaldi offers Chromium. On extension support, Mozilla Firefox gives you Own_store where Vivaldi offers Chrome_store. Mozilla Firefox offers open source; Vivaldi doesn't.

Mozilla Firefox is the better fit for open-source privacy-conscious everyday browsing. Vivaldi is the better fit for power users who want extensive customization.

  • Mozilla Firefox fits best

    Open-source privacy-conscious everyday browsing

  • Vivaldi fits best

    Power users who want extensive customization

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Side by side

Feature Mozilla Firefox 9.1/10 Visit ↗ Vivaldi 8.8/10 Visit ↗
At a glance
Editor score 9.1 8.8
Ranking #3 in Web Browsers #6 in Web Browsers
Best for Open-source privacy-conscious everyday browsing Power users who want extensive customization
Pricing model Free Free
Starting price Free plan Free plan
Free plan ✓ ✓
Free trial — —
Deployment Desktop, Mobile Desktop, Mobile
Platforms Windows, macOS, Linux, iOS, Android Windows, macOS, Linux, iOS, Android
Support Community, Docs Tickets, Community, Docs
Built for Solo, Small business, Mid-market, Enterprise Solo, Small business, Mid-market, Enterprise
Features Mozilla Firefox 3/3 · Vivaldi 2/3
Built-in ad blocking ✓ ✓
Cross-device sync ✓ ✓
Open source ✓ (best) —
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
  • Deep tab organization with tiling, stacking, and workspaces
  • End-to-end encrypted synchronization across devices
  • Built-in productivity tools plus Chrome Web Store compatibility
Cons
  • Sync requires a Mozilla account
  • Extensions and themes use Mozilla’s own add-on store
  • No paid tier for additional browser features
  • No AI features
  • Not fully open source
  • Chromium-based architecture may not suit non-Chromium users
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 →

Vivaldi is a free web browser for desktop and mobile users who want extensive control over interface design, tab organization, privacy controls, and built-in productivity tools. It is available on Windows, macOS, Linux, Android, and iOS.…

Read the review →
  1. Mozilla FirefoxWeb Browsers 9.1Free plan
  2. VivaldiWeb Browsers 8.8Free plan

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

  • Vivaldi — where it wins

    • Deep tab organization with tiling, stacking, and workspaces
    • End-to-end encrypted synchronization across devices
    • Built-in productivity tools plus Chrome Web Store compatibility

    Where it doesn't

    • No AI features
    • Not fully open source
    • Chromium-based architecture may not suit non-Chromium users
  • Mozilla Firefox9.1/10 · Free plan

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

    Visit FirefoxFull verdict →
  • Vivaldi8.8/10 · Free plan

    Vivaldi suits power users who want deep control over tabs, tools, and interface design.

    Visit VivaldiFull 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