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Head-to-head · Web Browsers

Mozilla Firefox vs Opera

  • 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
Opera #5 in Web Browsers 8.9/10 Free plan Free plan✓ 2 of 3 features Visit Opera

Mozilla Firefox leads on 0 checks, Opera 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
  • Most featuresMozilla Firefox · 3 of 3

Mozilla Firefox scores higher on our rubric for web browsers: 9.1 against 8.9 out of 10; our editors rank them #3 and #5.

On browser engine, Mozilla Firefox gives you Gecko where Opera offers Chromium. On extension support, Opera gives you Both where Mozilla Firefox offers Own_store.

Mozilla Firefox is the better fit for open-source privacy-conscious everyday browsing. Opera is the better fit for users wanting built-in tools and many integrations.

  • Mozilla Firefox fits best

    Open-source privacy-conscious everyday browsing

  • Opera fits best

    Users wanting built-in tools and many integrations

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Side by side

Feature Mozilla Firefox 9.1/10 Visit ↗ Opera 8.9/10 Visit ↗
At a glance
Editor score 9.1 8.9
Ranking #3 in Web Browsers #5 in Web Browsers
Best for Open-source privacy-conscious everyday browsing Users wanting built-in tools and many integrations
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
Features Mozilla Firefox 3/3 · Opera 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 Both
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
  • Built-in ad and tracker blocking plus a free browser VPN
  • Syncs bookmarks, history, passwords, and open tabs across devices
  • Combines workspaces, AI, messaging, sharing, and productivity tools
Cons
  • Sync requires a Mozilla account
  • Extensions and themes use Mozilla’s own add-on store
  • No paid tier for additional browser features
  • Its broad feature set may feel busy for users wanting a minimal browser
  • The browser VPN is a built-in feature rather than a general device VPN
  • Some integrated services depend on the supported messenger and social platforms
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 →

Opera is a free web browser for desktop and mobile users who want more than page viewing and extension support. It runs on Windows, macOS, Linux, iOS, and Android, with a Chromium browser engine and extensions available through Opera’s…

Read the review →
  1. Mozilla FirefoxWeb Browsers 9.1Free plan
  2. OperaWeb Browsers 8.9Free 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

  • Opera — where it wins

    • Built-in ad and tracker blocking plus a free browser VPN
    • Syncs bookmarks, history, passwords, and open tabs across devices
    • Combines workspaces, AI, messaging, sharing, and productivity tools

    Where it doesn't

    • Its broad feature set may feel busy for users wanting a minimal browser
    • The browser VPN is a built-in feature rather than a general device VPN
    • Some integrated services depend on the supported messenger and social platforms
  • Mozilla Firefox9.1/10 · Free plan

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

    Visit FirefoxFull verdict →
  • Opera8.9/10 · Free plan

    Opera combines privacy controls, syncing, AI, messaging, and workspaces at no browser cost.

    Visit OperaFull 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