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Updated April 2026

Best SEO Extensions for Firefox 2026

Most SEO content focuses on Chrome — but the best extensions are available on Firefox too. Here's exactly which tools work, which don't, and what the Firefox versions can do.

3 fully supported toolsAll free tier availableChrome alternatives where needed
Bottom line for Firefox users
Firefox support for SEO extensions is better than most people realise. Ahrefs Toolbar, SEOquake, and MozBar all have official Firefox versions with full feature parity. Keyword Surfer (Chrome-only) is the main gap — but SEOquake's SERP overlay partially fills it with traffic estimates. Install all three; together they cover every use case.

SEO Extensions That Work on Firefox

Ahrefs SEO Toolbar
Freemium

Full feature parity with Chrome version. On-page audit, broken link checker, redirect tracer, HTTP headers, country/language switcher. No account needed for free features.

On-page auditRedirect traceLink checker
Full review
SEOquake
Free

Best free SERP overlay on Firefox. Authority Score, backlinks, traffic estimates, and page age for every Google result. Full on-page audit included. CSV export works.

SERP overlayOn-page auditCSV export
Full review
MozBar
Freemium

DA/PA authority scores on every page and SERP result. Spam score checker for link prospecting. Free Moz account unlocks bulk SERP analysis.

DA/PA scoresSpam scoreSERP analysis
Full review
Wappalyzer
Freemium

Tech stack detector — identifies CMS, CDN, analytics, ecommerce platform and more on any site. Essential for competitor research. Firefox version fully supported.

Tech stackCompetitor research
Full review

Firefox vs Chrome — Feature Comparison

ExtensionFirefoxChromeDifferences
Ahrefs Toolbar✓ Full✓ FullNone — feature parity
SEOquake✓ Full✓ FullNone — feature parity
MozBar✓ Full✓ FullNone — feature parity
Keyword Surfer✗ No✓ FullChrome only — no Firefox version
Semrush Toolbar✗ No✓ FullChrome only
Wappalyzer✓ Full✓ FullFeature parity

The Main Gap: Keyword Surfer

The only significant missing tool on Firefox is Keyword Surfer — the best free extension for seeing search volumes directly in Google results. There is no Firefox version and no confirmed plan to release one.

Best workaround: SEOquake shows estimated organic traffic for each result in the SERP overlay, which is a partial substitute. For keyword volume data specifically, Firefox users can use Google Keyword Planner (free, browser-agnostic) or a paid tool like Ahrefs or Semrush.

How to Install SEO Extensions on Firefox

All Firefox extensions install from the Mozilla Add-ons directory at addons.mozilla.org. Search by name, click Add to Firefox, confirm permissions. Extensions appear in the toolbar or the extensions menu (puzzle icon, top right).

To pin an extension to the Firefox toolbar: click the Extensions icon → three-dot menu next to the extension → Pin to Toolbar.

Frequently Asked Questions

Ahrefs SEO Toolbar, SEOquake, MozBar, and Wappalyzer all have full Firefox versions with feature parity to Chrome. The main gap is Keyword Surfer, which is Chrome-only. SEOquake's traffic estimates in the SERP overlay provide a partial substitute for search volume data.
Yes — install from addons.mozilla.org. The Firefox version has all the same free features: on-page SEO report, redirect tracer, broken link checker, HTTP header reader, and country/language switcher for Google.
Yes, fully. SEOquake for Firefox offers the complete feature set: SERP overlay with authority scores, on-page audit, keyword density analysis, and CSV export — all free with no account required.

Related

All SEO ExtensionsSEO Extensions for SafariAhrefs Toolbar for FirefoxSEOquake ReviewMozBar ReviewAhrefs Toolbar Review