SEOquake for Firefox 2026: Free SERP Overlay Add-on
SEOquake is the only free SEO add-on that injects authority metrics, backlink counts, and traffic estimates directly into every Google search result. No account needed, no daily limit, no upsell on every panel. The Firefox version has full feature parity with the Chrome version. Here's how to install it and what to expect.
100% free, no accountOfficial Firefox add-onMade by Semrush
Yes, SEOquake has a free official Firefox version on addons.mozilla.org, published by Semrush. Install it, run any Google search, and SEOquake injects Authority Score, backlink count, page age, and Semrush traffic estimate under every result. Same feature set as the Chrome version, no sign-in required.
Five steps, under two minutes. Always install from the official Mozilla Add-ons directory, Semrush publishes the add-on there directly and the listing has a green "Recommended" badge. The official URL is addons.mozilla.org/firefox/addon/seoquake-seo-extension.
1
Open Mozilla Add-ons
In Firefox, go to addons.mozilla.org and search for SEOquake. The official listing is published by Semrush and carries the green "Recommended" badge. Don't install lookalikes from other publishers.
2
Click "Add to Firefox"
On the listing page, click Add to Firefox. Firefox shows a permissions dialog. SEOquake needs to access your data on all websites (necessary for the on-page audit and SERP overlay). Click Add to confirm.
3
Pin the SEOquake icon
The "SQ" icon may appear directly in your Firefox toolbar, or be hidden in the puzzle-piece overflow menu. If hidden: click the puzzle icon → find SEOquake → click the gear icon next to it → choose Pin to Toolbar. The icon stays in your toolbar permanently.
4
Run any Google search
Go to google.com and search for anything. SEOquake injects a row of metrics under each result: Authority Score (formerly SEMrush Rank), backlinks (LinkRank), age, traffic estimate, and Whois link. You don't need to click the icon, the overlay appears automatically on every SERP.
5
Click any page for the on-page audit
Click the SEOquake icon on any webpage to open the side panel: title, meta description, headings, keyword density, internal/external link counts, and the full on-page SEO diagnosis. No account, no sign-in prompt, every panel works free.
For other browsers: SEOquake also has a Chrome version (Chrome Web Store), an Opera add-on, and an Edge version (Chromium-based, installs from Chrome Web Store). There is no Safari version of SEOquake. Mac users who need a free SERP overlay should consider the Ahrefs SEO Toolbar instead, which does have a Safari build via the Mac App Store. See our SEO extensions for Safari guide.
What SEOquake Firefox shows you
SEOquake's value is the SERP overlay, no other free Firefox add-on shows authority and backlink data directly on Google search results in 2026 without making you sign in first. On every Google search you run, SEOquake injects a row of metrics under each result. By default it shows:
Authority Score, Semrush's domain authority metric, 0–100, based on Semrush's link database.
LinkRank. Semrush's count of referring domains pointing to the page.
SEMrush Traffic, estimated monthly organic traffic to the domain.
Age, when the domain was first indexed.
Whois link. One-click jump to the Whois record for the domain.
Cache, Google's cached version of the result.
Index counts, how many pages from this domain are indexed in Google and Bing.
Customise which metrics show by clicking the SEOquake icon → Settings → SERP Overlay. You can also export the full SERP as CSV. Useful for content briefs, competitor research, and ranking reports.
Features available free on Firefox
Everything SEOquake offers is free with no account. Same feature list as the Chrome version:
SERP overlay
Metrics injected under every Google result, Authority Score, backlinks, traffic, age.
On-page SEO audit
Side panel with title, description, headings, canonical, robots, hreflang.
Keyword density
Per-page keyword density analysis with single-word, two-word, and three-word phrases.
Internal & external link count
Counts every link on the current page, broken down by internal, external, and nofollow.
SEO bar
Always-on metric bar at the top of every page showing the current page's stats.
CSV export
Export the full Google SERP, every result with its metrics. As a CSV file.
SERP comparison
Compare SERPs across different Google country/language combinations side by side.
Page status check
Quick checks for robots.txt rules, sitemap presence, and HTTP status.
Firefox vs Chrome, what's the same
Semrush maintains both browser versions from a single codebase, so the feature parity is total in 2026. The dropdown panel UI is pixel-identical, the SERP overlay logic is identical, the keyword density algorithm is identical, and updates land on both browsers simultaneously. The only environmental differences are:
Permissions wording. Firefox phrases the "access your data on all sites" prompt differently from Chrome, same underlying permission.
Tracking protection. Firefox's Enhanced Tracking Protection is stricter than Chrome's defaults. On strict mode, SEOquake's API calls to semrush.com can be blocked. See the troubleshooting section below.
uBlock Origin. Firefox users typically run uBlock Origin in stricter modes than Chrome users. SEOquake's tracking script for usage analytics can be blocked, the SERP overlay still works.
SEOquake not working on Firefox
Three issues account for almost every "SEOquake Firefox not working" report. In order of frequency:
1. Enhanced Tracking Protection (strict mode)
Firefox's tracking protection in strict mode blocks the cross-origin request SEOquake makes to semrush.com. Click the shield icon in Firefox's address bar (left of the URL) → toggle protection to Standard, or add semrush.com as an exception in Privacy & Security → Enhanced Tracking Protection → Manage Exceptions.
2. uBlock Origin blocking the SEOquake script
uBlock's default filter lists sometimes block the Semrush analytics script. Click the uBlock icon → open the dashboard → switch to "My Rules" → temporarily add an exception for semrush.com. The SERP overlay will resume on next reload.
3. Outdated extension version
If you installed SEOquake more than 12 months ago and Firefox didn't auto-update it, the API endpoints may have changed. Go to about:addons → SEOquake → check for updates manually, or remove and reinstall from addons.mozilla.org.
SEOquake on Firefox forks: The Firefox add-on installs on LibreWolf, Waterfox, and Pale Moon, but the privacy-hardened defaults usually break the SERP overlay. On LibreWolf, you'll need to disable resistFingerprinting and add semrush.com to the cookie allow-list. On Pale Moon (which is not Firefox-derived since 2018), SEOquake may not install at all, use Waterfox if you need Firefox extensions on a non-mainstream fork.
SEOquake on Firefox vs alternatives
SEOquake's defining feature is the free SERP overlay with metrics. No other free Firefox SEO add-on does this in 2026 without making you sign in. Two practical comparisons:
SEOquake vs Ahrefs Toolbar on Firefox: SEOquake is better for SERP overlays (Ahrefs needs a paid account for SERP metrics); Ahrefs is better for on-page auditing (redirect tracer, headers reader, UA switcher are Ahrefs-only). Most SEOs install both. Full comparison →
SEOquake vs MozBar on Firefox: SEOquake wins decisively in 2026, MozBar is barely maintained, most of its features need paid Moz Pro, and SEOquake's free overlay is more comprehensive. Full comparison →
Yes. SEOquake has an official Firefox version published by Semrush on the Mozilla Add-ons directory (addons.mozilla.org). The Firefox add-on has the same feature set as the Chrome version: SERP overlay on Google with Authority Score and backlink metrics, on-page SEO audit, keyword density analysis, and CSV export. It's completely free with no account required.
Visit addons.mozilla.org in Firefox and search for "SEOquake". The official add-on is published by Semrush. Click "Add to Firefox", accept the permissions dialog, and the icon appears in your toolbar. Pin it from the puzzle-piece overflow menu if it's hidden. Run any Google search to see SEOquake's metrics injected below each result.
Yes. SEOquake is completely free on Firefox with no premium tier and no sign-in requirement. Every feature, SERP overlay with Authority Score and backlink data, on-page SEO audit, keyword density tool, internal/external link counts, page age, index status, and CSV export. Works without an account. Semrush makes the add-on as a top-of-funnel tool for the paid Semrush platform, but the add-on itself stays free.
Most common cause: Firefox's Enhanced Tracking Protection in strict mode blocks SEOquake's API call to semrush.com. Click the shield icon in Firefox's address bar and switch tracking protection to standard for Google search pages, or whitelist semrush.com. Other causes: uBlock Origin blocking the script (add an exception for semrush.com), or an outdated extension version (check addons.mozilla.org for the latest).
Yes. SEOquake by Semrush is officially supported on Mozilla Firefox. Install it from the Mozilla Add-ons directory at addons.mozilla.org, search for "SEOquake" and the official Semrush listing appears with a green Recommended badge. The Mozilla Firefox version works identically to the Chrome version: SERP overlay with metrics, on-page SEO audit, keyword density, and CSV export, all free without a Semrush account.