Firefox SEO extensions are add-ons you install from addons.mozilla.org that show, inside the browser, data you'd otherwise have to dig out of the source code or an external tool: meta tags, headings, redirects, search volumes, domain metrics.
Firefox has far fewer of them than Chrome, and the gap isn't just about numbers. We took the 18 SEO and tracking extensions from our list checked on the Chrome Web Store and looked for each one on Mozilla's store: 9 don't exist, and of the 9 that do, only 6 have had an update in 2026.
Below are the extensions that actually work on Firefox, with users, rating and date of the last update as read on 1 October 2026, a table of what's missing compared with Chrome, and an alternative for each gap.
The Firefox SEO extensions we checked on addons.mozilla.org
User numbers are the ones each extension's page shows on addons.mozilla.org (AMO), which is the average number of daily users calculated by Mozilla. Where two readings a few hours apart gave slightly different values, we rounded and wrote "about".
| Extension | Users on AMO | Rating (reviews) | Last update | Publisher |
|---|---|---|---|---|
| On-page SEO | ||||
| Detailed SEO Extension | 7,659 | 4.3 (23) | 8 May 2026 | Detailed.com |
| SEO META 1 COPY | 3,094 | 5.0 (10) | 29 May 2026 | macha |
| SiteAnalyzer SEO Tools | 813 | 4.8 (16) | Sep 2026 | BrokenByte Software |
| Web Developer | about 66,000 | 4.3 (494) | 25 Jun 2024 | Chris Pederick |
| Google Lighthouse | 15,238 | 3.6 (50) | 17 Aug 2023 | "Google Lighthouse" account |
| Keywords and competitors | ||||
| SEOquake | 13,355 | 4.5 (157) | 3 Jan 2023 | SeoQuake Team (Semrush) |
| Similarweb | 8,994 | 4.0 (104) | 3 Nov 2019 | Similarweb |
| Keywords Everywhere | 7,017 | 4.4 (408) | 16 Sep 2026 | Axeman Tech |
| Ahrefs SEO Toolbar | 4,928 | 3.3 (27) | 15 Sep 2026 | Ahrefs |
| SEO Minion | 1,687 | 4.1 (74) | 20 Feb 2026 | Axeman Tech |
| Mangools SEO Extension | 711 | 3.5 (24) | 3 Apr 2020 | Mangools |
| Serpstat Website SEO Checker | 459 | 4.0 (5) | 26 Dec 2023 | Serpstat |
| MozBar | 221 | 5.0 (2) | 17 Sep 2026 | Moz |
| Technical and day-to-day work | ||||
| Firefox Multi-Account Containers | over 400,000 | 4.6 (8,066) | 1 Jul 2026 | Mozilla |
| Wappalyzer | about 115,000 | 4.4 (548) | Aug 2026 | Wappalyzer |
| User-Agent Switcher and Manager | about 85,000 | 4.1 (783) | Sep 2026 | Ray |
| Link Redirect Trace | 2,677 | 4.2 (20) | 25 Apr 2024 | LinkResearchTools |
The first thing that stands out is the scale. SEOquake, the most installed SEO extension on Firefox, has 13,355 users; the same extension on the Chrome Web Store claims 1,000,000. The two metrics aren't identical (Mozilla counts a daily average, Google a rounded number of users), but the order of magnitude holds: an SEO extension on Firefox has tens of times fewer users than its Chrome version.
Fewer users means less pressure on the publisher to keep the Firefox version up to date. That thread runs through almost everything that follows.
How we ran the check
For each extension we read the public listing through the addons.mozilla.org API, which returns the same values shown on the page (users, average rating, number of reviews, date of the last update). Our starting list was the SEO and tracking extensions from our Chrome list, checked at the end of September 2026, plus those ranking near the top of Google for "firefox seo extensions" in the United States and for "estensioni firefox seo" (Firefox SEO extensions) in Italy. On 10 October 2026 we also checked the first page of Google UK for "firefox seo tools": it added two candidates, SEO Website Scanner (221 users, a single review, last updated August 2024) and All in One SEO Analyzer by SEOA (19 users), and we left both out.
We dropped listings with fewer than 200 users except MozBar, which we kept because it's Moz's official version, and extensions that have "SEO" in the name but do something else (Mozilla returns 1,213 results for a search on "seo", and near the top are a cookie editor and a YouTube plugin).
On-page SEO: reading titles, meta tags and headings without opening the code
This is where Firefox does best, because the job is simple: read the DOM of the open page and lay it out neatly.
Detailed SEO Extension is the most reliable choice. It shows title, meta description, canonical, robots, heading structure, links and structured data in one panel, and it was updated in May 2026. It has 600,000 users on Chrome and 7,659 on Firefox, but the features are the same. If you need a quick look at a page's meta title and meta description, this is all you need.
SEO META 1 COPY does one thing: it shows the meta tags and copies them in one click. With 3,094 users and a May 2026 update, it's the closest substitute for SEO META in 1 CLICK, which has a million users on Chrome and doesn't exist on Firefox. Note that it comes from a different developer; it isn't a port.
SiteAnalyzer SEO Tools is the surprise of the list. Few users (813), a high rating (4.8 from 16 reviews) and frequent updates: it audits links, images, meta tags and indexing for the open page.
Web Developer by Chris Pederick wasn't built for SEO, but it's still handy for switching off JavaScript or CSS to see what's left of the page, a basic technical SEO check on sites built with JavaScript frameworks. The latest version dates from June 2024.
Google Lighthouse needs handling with care. The AMO listing has 15,238 users but hasn't changed since August 2023, and it doesn't run Lighthouse in the browser: it sends the URL to the PageSpeed Insights API and only works on public pages. To measure Core Web Vitals you may as well open PageSpeed Insights directly, which uses the same engine and doesn't depend on an extension nobody maintains any more.
Keywords and competitors: where Firefox means paying or falling behind
This is where things change. Extensions that show volumes, difficulty and backlinks depend on an external service, and on Firefox they're either tied to a subscription or haven't been touched for years.
Keywords Everywhere is the most recently updated in the category (16 September 2026) and shows volumes, CPC and trends right in the Google results. You pay in credits: according to the official price list one credit covers one keyword, the smallest pack is 200,000 credits for $80 (the vendor only quotes US dollars) and credits expire after a year. Without credits the extension shows much less.
Ahrefs SEO Toolbar was updated in September 2026 but has the lowest rating among the big publishers' extensions: 3.3 from 27 reviews, against 4.4 for the same extension on Chrome. The on-page part costs nothing; backlink and keyword difficulty metrics need an Ahrefs subscription. If you're deciding whether to pay for one, we've compared the alternatives to Ahrefs and their prices.
SEOquake by Semrush has more users than any other SEO extension on Firefox, but its last update was on 3 January 2023. It still works for basic page and SERP data; the risk is that a change to Google's layout breaks it and nobody fixes it.
MozBar is the opposite case: 221 users, a version updated on 17 September 2026 and compatibility with Firefox for Android from version 142. It shows Moz's Domain Authority in the SERP and on pages; full data needs an account.
SEO Minion (updated February 2026) checks broken links, hreflang and SERP previews, but its AMO description is explicit: it only works if you have a Keywords Everywhere Silver plan or higher. If you work on multilingual sites and want a quick hreflang check, factor that in.
That leaves three extensions we'd advise against installing today: Similarweb (last updated November 2019), Mangools (April 2020) and Serpstat Website SEO Checker (December 2023). The listings are still live and people keep installing them; Mangools is even on the first page of Google UK for "firefox seo tools". But three to six years without updates is too long for an extension that reads Google's results pages.
Redirects, user agents and technologies: the technical extensions
Link Redirect Trace by LinkResearchTools is the alternative to Ayima's Redirect Path, which isn't available on Firefox. It shows the redirect chain with status codes and the canonical, handy for checking a 301 redirect after a migration. Its last update was in April 2024.
You can also do the same check without any extension: the Network Monitor in Firefox's developer tools lists every HTTP request with its status code, including the intermediate steps of a redirect.
User-Agent Switcher and Manager (about 85,000 users, updated September 2026) changes the browser's user agent. It shows you how a server responds when a request comes from a smartphone or claims to be Googlebot. It isn't a reliable test of how Google sees a site, because many servers recognise the real Googlebot through a reverse DNS lookup, as the Google Search Central documentation explains, but it's enough to catch sites that serve different content depending on the user agent.
Wappalyzer is the most installed on the list after Mozilla's containers: about 115,000 users. It tells you which CMS, framework and analytics tools a site is built with, which saves a fair amount of time in a competitor analysis.
What Firefox is missing compared with Chrome
This is the table we couldn't find in any guide, Italian, American or British. It lists the 18 SEO and tracking extensions from our Chrome list, with the number of users shown on the Chrome Web Store at the end of September 2026 and their status on addons.mozilla.org on 1 October 2026.
| Extension | Users on Chrome | On Firefox | Last update on Firefox | Firefox alternative |
|---|---|---|---|---|
| META SEO inspector | 200,000 | No | Detailed SEO Extension | |
| Detailed SEO Extension | 600,000 | Yes | 8 May 2026 | |
| SEO META in 1 CLICK | 1,000,000 | No | SEO META 1 COPY | |
| Redirect Path | 300,000 | No | Link Redirect Trace or Network Monitor | |
| Lighthouse | 1,000,000 | Yes, listing not maintained | 17 Aug 2023 | PageSpeed Insights website |
| SEOquake | 1,000,000 | Yes | 3 Jan 2023 | |
| Keywords Everywhere | 1,000,000 | Yes | 16 Sep 2026 | |
| Keyword Surfer | 600,000 | No | Keywords Everywhere (paid) | |
| Ahrefs SEO Toolbar | 400,000 | Yes | 15 Sep 2026 | |
| MozBar | 900,000 | Yes | 17 Sep 2026 | |
| SEO Minion | 200,000 | Yes | 20 Feb 2026 | |
| Open SEO Stats | 200,000 | No | No equivalent | |
| Similarweb | 1,000,000 | Yes | 3 Nov 2019 | |
| Wappalyzer | 3,000,000 | Yes | Aug 2026 | |
| Tag Assistant | 3,000,000 | No | Chrome or Edge | |
| Tag Assistant Companion | 500,000 | No | Chrome or Edge | |
| Google Analytics Debugger | 600,000 | Third-party versions only | Chrome or Edge | |
| Meta Ads Data Advisor | 3,000,000 | No | Chrome or Edge |
The biggest gap is in tracking. None of Google's or Meta's official tools for checking tags and pixels has a Firefox version. If your work includes debugging Google Tag Manager or ad pixels, you'll need a second, Chromium-based browser anyway.
The gap in no-cost keyword research inside the SERP is almost as wide: Keyword Surfer and Open SEO Stats aren't there, and the only up-to-date extension that shows volumes is a paid one. For keyword research done properly you're better off starting from a dedicated tool rather than an extension anyway.
The reason is market share, and in the UK it's starker than elsewhere. According to StatCounter, Firefox had 3.7% of the UK desktop market in September 2026, against 49.82% for Chrome and 27.66% for Edge; worldwide it was at 6.11%. Edge is built on Chromium and installs extensions from the Chrome Web Store, so in the UK more than three desktop users in four are on a browser that runs Chrome extensions. For an SEO tool publisher, keeping a second version going for fewer than one user in twenty-five is a cost that's hard to justify.
Why Firefox still belongs in your SEO kit
Three things Firefox does and Chrome doesn't, and that matter more in SEO work than the missing extensions.
Containers for juggling several Google accounts
Firefox Multi-Account Containers is a Mozilla extension with over 400,000 users and a 4.6 rating from 8,066 reviews. Each container keeps its own cookies: in one tab you're logged into one client's Google account, in the next tab into another's, with no private windows or separate profiles. If you open Google Search Console for several properties with different accounts every day, this is the most practical reason to use Firefox.
Extensions don't lose features to Manifest V3
Chrome has moved to Manifest V3, which restricts the blocking webRequest API, the one needed to intercept and modify requests. In a March 2024 update, Mozilla wrote that Firefox has no plans to deprecate Manifest V2 and keeps supporting blocking webRequest. For extensions that rewrite headers or intercept redirects, that's a real technical advantage.
Extensions work on Android too
Since 14 December 2023, as announced by Mozilla, Firefox for Android accepts every extension marked as compatible on AMO. Among the SEO extensions on our list, MozBar is the only one with declared Android compatibility, but for checking a mobile SERP from your phone that's already something.
Four checks before installing an SEO extension on Firefox
- Date of the last update. If it's more than two years old, treat an extension that reads Google's pages as abandoned, even if the listing is still live.
- Publisher. Check it's the same as for the Chrome version. AMO has extensions with names almost identical to well-known ones (SEO META 1 COPY and SEO META in 1 CLICK, for example) published by other developers.
- Rating compared with Chrome. If the same extension has a much lower rating on Firefox, as Ahrefs SEO Toolbar does (3.3 against 4.4), the Firefox version usually has problems the Chrome one doesn't.
- Permissions requested. AMO lists them on the page before you install. An extension that shows meta tags doesn't need to read your data on every site at all times, even though many ask for it.
If managing your tool kit takes up more time than the analysis, that's the kind of work we do every day in our SEO services: we choose the tools, you get the priorities. And if you want the full picture of tools beyond the browser, see our pick of the best SEO tools.
Frequently asked questions about Firefox SEO extensions
For on-page analysis, Detailed SEO Extension, updated in May 2026. For volumes and CPC in the SERP, Keywords Everywhere, which runs on paid credits. For redirects and canonicals, Link Redirect Trace. Ahrefs SEO Toolbar and MozBar were updated in 2026 but only show full metrics with a paid account.
Not directly: you install them from addons.mozilla.org, and only if the publisher has released a Firefox version. Of the 18 SEO and tracking extensions we checked, 9 have no Firefox version, including Redirect Path, Keyword Surfer and Tag Assistant.
Yes, the listing is live and has 13,355 users, but the last update dates back to 3 January 2023. It works for basic page data; for daily use in the SERP it's worth pairing it with an extension that's still maintained.
Yes. Moz publishes MozBar on addons.mozilla.org, with a version updated in September 2026 that also works on Firefox for Android. You need a Moz account to see the full data.
It depends on the extension. Since 14 December 2023 Firefox for Android accepts extensions marked as compatible on AMO. Among the SEO extensions we checked, MozBar is the only one with declared Android compatibility.
One thing the industry rarely says: having fewer extensions is also an advantage. Every SEO extension that adds numbers and panels to the SERP changes what you see compared with a real searcher. Keeping Firefox as a "clean" browser, with containers for your accounts and nothing layered over the page, is the simplest way to look at a SERP or a page the way an ordinary user sees it, before you analyse it with your tools.
