The best SEO browser extensions in 2026 are the Ahrefs SEO Toolbar for all-round on-page and SERP checks, Detailed for a clean page inspection, SEOquake or MozBar for metrics on every Google result, and Keywords Everywhere or Keyword Surfer for search volume. Most SEOs run three or four together rather than one toolbar that does everything.
I checked all 15 extensions below in the Chrome Web Store and on addons.mozilla.org on 30 September 2026: who publishes them, whether they are on Chrome and Firefox, how many users they have, their rating and when they were last updated. The user counts and ratings in this article are the store figures from that day.
SEO browser extensions compared
| Extension | Browsers | Price | Chrome users | Chrome rating |
|---|---|---|---|---|
| Ahrefs SEO Toolbar | Chrome, Firefox, Safari | Free; full Ahrefs metrics need a paid plan | 400,000 | 4.4 |
| MozBar | Chrome, Firefox | Free with a Moz account; more data with Moz Pro | 900,000 | 3.3 |
| SEOquake | Chrome, Firefox (Firefox listing last updated January 2023) | Free | 1,000,000 | 4.5 |
| Detailed SEO Extension | Chrome, Firefox | Free | 600,000 | 4.9 |
| Keywords Everywhere | Chrome, Firefox | Paid credits for volume data | 1,000,000 | 4.5 |
| SEO Minion | Chrome, Firefox, Edge | Free for the core checks | 200,000 | 4.0 |
| META SEO inspector | Chrome | Free | 200,000 | 4.4 |
| Link Redirect Trace | Chrome, Firefox | Free | 100,000 | 4.8 |
| Redirect Path | Chrome | Free | 300,000 | 4.3 |
| Check My Links | Chrome, Firefox (new listing) | Free | 90,000 | 4.5 |
| Lighthouse | Chrome (also built into DevTools), Firefox add-on | Free | 1,000,000 | 4.4 |
| Wappalyzer | Chrome, Firefox | Free; paid plans for bulk lookups | 3,000,000 | 4.6 |
| Similarweb | Chrome (the Firefox listing hasn't been updated since 2019) | Free | 1,000,000 | 4.6 |
| Keyword Surfer | Chrome | Free | 600,000 | 4.2 |
| HeadingsMap | Chrome, Firefox | Free | 100,000 | 4.5 |
1. Ahrefs SEO Toolbar
The best all-round SEO toolbar, and the one most SEOs install first.
Click the icon on any page and you get an on-page report: title and meta description length, word count, the heading structure, indexability tags (noindex, canonical, hreflang), structured data, social tags, images and HTTP headers. On Google results it lets you switch country and language without a VPN, and it shows keyword ideas and People Also Ask questions next to the SERP. It also has a redirect tracer and highlights outgoing links by type.
- Browsers: Chrome, Firefox, Safari
- Price: Signing in with a free Ahrefs account adds Domain Rating and URL Rating for any site. The full SERP metrics (traffic, keywords and backlinks per result) only show if you have a paid Ahrefs subscription.
- Chrome Web Store: 400,000 users, rated 4.4
- Weakness: The most useful metrics sit behind the paid plan, so on a free account it works as an on-page checker more than a research tool.
2. MozBar
Best for checking Domain Authority and Page Authority while you browse.
MozBar overlays Moz Domain Authority, Page Authority and linking domain counts on every Google result and on any page you visit. The page analysis panel shows on-page elements, markup and HTTP status, and you can highlight followed, nofollowed, internal and external links.
- Browsers: Chrome, Firefox
- Price: It needs a free Moz login. Moz Pro subscribers get extra data in the same toolbar.
- Chrome Web Store: 900,000 users, rated 3.3
- Weakness: Its 3.3 rating in the Chrome Web Store is the lowest on this list, and you have to stay logged in to Moz for the metrics to load. The Firefox version exists but has a small user base.
3. SEOquake
Best free overlay for SERP metrics, made by Semrush.
SEOquake adds a bar under every Google result with metrics like indexed pages, backlinks and Semrush rank, and it runs an on-page SEO audit, an internal and external link report, and a side-by-side URL comparison. Everything exports to a file.
- Browsers: Chrome, Firefox (Firefox listing last updated January 2023)
- Price: It is free. Some metrics link out to Semrush, which is paid.
- Chrome Web Store: 1,000,000 users, rated 4.5
- Weakness: The SERP overlay is busy and slows result pages down. Turn off the metrics you don't use. The Chrome version gets updates (the last one was 28 September 2026); the Firefox listing hasn't been updated since 2023.
4. Detailed SEO Extension
Best clean on-page inspector, and the highest-rated extension on this list.
Built by Glen Allsopp's Detailed, it shows the title, meta description, canonical, robots tags (including X-Robots HTTP headers), an indented heading outline, schema markup, links and images in one panel. The right-click menu opens the current page or domain in Ahrefs, Moz, Majestic, Similarweb, Semrush or the Wayback Machine.
- Browsers: Chrome, Firefox
- Price: Free, with no upsells and no tracking according to Detailed.
- Chrome Web Store: 600,000 users, rated 4.9
- Weakness: It only covers the page you are on. There is no keyword data and no SERP overlay.
5. Keywords Everywhere
Best for seeing search volume and CPC on Google and other sites.
Keywords Everywhere adds search volume, CPC and competition next to your Google searches, plus related keywords and "people also search for" lists in the sidebar. It works on YouTube, Amazon, Etsy and other sites too, and recent versions add AI Overview and traffic metrics.
- Browsers: Chrome, Firefox
- Price: The extension is free to install, but the volume and CPC data use paid credits.
- Chrome Web Store: 1,000,000 users, rated 4.5
- Weakness: Without credits it shows very little, so budget for it before you rely on it.
6. SEO Minion
Best multi-tool for daily on-page checks.
SEO Minion analyses on-page SEO (meta tags, headings, Open Graph), checks broken links and redirects, highlights links, previews your snippet in the SERP, simulates Google results from other locations, checks hreflang tags, compares source HTML with the rendered DOM and scrapes People Also Ask questions. It is made by the Keywords Everywhere team.
- Browsers: Chrome, Firefox, Edge
- Price: The core features are free.
- Chrome Web Store: 200,000 users, rated 4.0
- Weakness: The Chrome version was last updated in February 2026, and the interface feels older than Detailed or Ahrefs.
7. META SEO inspector
Best for spotting meta tag errors quickly.
It lists every meta tag on the page (title, description, robots, canonical, Open Graph, Twitter cards) and flags problems with warnings, like a missing description or a title that is too long. It also shows headings and structured data.
- Browsers: Chrome
- Price: Free.
- Chrome Web Store: 200,000 users, rated 4.4
- Weakness: Chrome only. A Firefox add-on with the same name exists from a different publisher, so don't install it by mistake.
8. Link Redirect Trace
Best for a full redirect and header report.
From LinkResearchTools, it traces every hop in a redirect chain (301, 302, meta refresh, JavaScript), with status codes, HTTP headers, the rel canonical, robots.txt status and link metrics for each step.
- Browsers: Chrome, Firefox
- Price: Free.
- Chrome Web Store: 100,000 users, rated 4.8
- Weakness: The Chrome version hasn't been updated since June 2024. It still works, but don't expect new features.
9. Redirect Path
Best lightweight redirect checker.
Made by the agency Ayima, it puts an icon in your toolbar that changes when a page redirects. Click it to see each hop, the status code (301, 302, 404, 500) and the HTTP headers.
- Browsers: Chrome
- Price: Free.
- Chrome Web Store: 300,000 users, rated 4.3
- Weakness: Chrome only, and it only reports what happened on the page you loaded.
10. Check My Links
Best for finding broken links on a page.
Check My Links crawls every link on the current page and highlights valid links in green and broken ones in red, so you can fix a page or find broken link building opportunities on someone else's resource page.
- Browsers: Chrome, Firefox (new listing)
- Price: Free.
- Chrome Web Store: 90,000 users, rated 4.5
- Weakness: It checks one page at a time. For a whole site you need a crawler. The Firefox version is new and has very few users so far.
11. Lighthouse
Best for page speed and technical audits.
Google's Lighthouse scores a page for performance, accessibility, best practices and SEO, and lists what to fix, including Core Web Vitals issues. In Chrome it is also built into DevTools, so you don't strictly need the extension.
- Browsers: Chrome (also built into DevTools), Firefox add-on
- Price: Free.
- Chrome Web Store: 1,000,000 users, rated 4.4
- Weakness: It measures lab data for one page at a time, which can differ from what real visitors experience.
12. Wappalyzer
Best for seeing what a site is built with.
Wappalyzer shows the CMS, ecommerce platform, analytics, tag managers, frameworks and hosting behind any site. For SEO it answers questions like "is this competitor on WordPress or Shopify?" or "which SEO plugin are they running?"
- Browsers: Chrome, Firefox
- Price: The extension is free. Bulk lookups and lead lists are paid.
- Chrome Web Store: 3,000,000 users, rated 4.6
- Weakness: It shows technology, not SEO metrics, so it is a supporting tool.
13. Similarweb
Best for estimating a competitor's traffic.
Similarweb shows estimated monthly visits, traffic sources, top countries, engagement and top keywords for any site. Newer versions add AI traffic (visits from ChatGPT, Gemini, Claude and Perplexity) and the prompts people use about a brand.
- Browsers: Chrome (the Firefox listing hasn't been updated since 2019)
- Price: Free in the extension. The full platform is paid.
- Chrome Web Store: 1,000,000 users, rated 4.6
- Weakness: The numbers are estimates and get rough for small sites with little traffic.
14. Keyword Surfer
Best free keyword volume overlay.
From Surfer, it adds search volume and CPC to Google searches, a list of keyword ideas with overlap scores, and the estimated traffic and word count of each ranking page. You can save keywords to collections and export them as a CSV.
- Browsers: Chrome
- Price: Free, and Surfer says it stays 100% free.
- Chrome Web Store: 600,000 users, rated 4.2
- Weakness: Chrome only, and the last Chrome update was in January 2026.
15. HeadingsMap
Best for checking heading structure.
HeadingsMap shows the H1 to H6 outline of any page in a side panel and flags skipped levels. It is the quickest way to check a competitor's article structure before you write your own.
- Browsers: Chrome, Firefox
- Price: Free.
- Chrome Web Store: 100,000 users, rated 4.5
- Weakness: It does one job. Pair it with Detailed or Ahrefs for the rest of the on-page checks.
The Ahrefs browser extension on Firefox
Yes, the Ahrefs SEO Toolbar works on Firefox. Ahrefs publishes it on addons.mozilla.org under the name "Ahrefs SEO Toolbar", and the Firefox version was updated on 15 September 2026, the same day as the Chrome version. It has the same features: the on-page report, SERP country switching, link highlighting and the redirect tracer, plus DR and UR when you sign in.
To install it, open addons.mozilla.org in Firefox, search for "Ahrefs SEO Toolbar" and check that the publisher is Ahrefs before you click "Add to Firefox". There are copies with similar names from other publishers. Ahrefs also offers a Safari version, though the setting to hide the toolbar on specific URLs is not available on Safari, according to Ahrefs.
The Firefox version has far fewer users than Chrome (about 4,900 against 400,000), so new features are tested on Chrome first. If you are deciding between Ahrefs and its alternatives, the toolbar alone is not a reason to pay. The free version covers most on-page checks.
SEO toolbar for Chrome vs Firefox
Chrome has the bigger catalogue. Every extension on this list runs on Chrome, and the Chrome versions get updated first. On Firefox, the maintained options are:
- Ahrefs SEO Toolbar (published by Ahrefs, updated September 2026)
- MozBar (published by Moz, updated September 2026)
- Detailed SEO Extension (published by Detailed.com)
- Keywords Everywhere and SEO Minion (both published by Axeman Tech, the Keywords Everywhere company)
- Wappalyzer and HeadingsMap
SEOquake and Similarweb have Firefox listings, but they haven't been updated in years (2023 and 2019). Redirect Path, META SEO inspector and Keyword Surfer are Chrome only. Edge and Brave run Chrome Web Store extensions, so everything here works on them too.
A Firefox SEO toolbar stack that covers everything: Ahrefs SEO Toolbar, Detailed, Keywords Everywhere and SEO Minion.
How to build your SEO toolbar stack
Each extension adds scripts to the pages you load, so ten of them running at once will slow your browser. Pick one per job:
| Job | Pick one |
|---|---|
| On-page check | Detailed, or the Ahrefs SEO Toolbar |
| Metrics on Google results | SEOquake (free) or MozBar (if you use Moz) |
| Search volume | Keyword Surfer (free) or Keywords Everywhere (paid credits) |
| Redirects and status codes | Redirect Path, or Link Redirect Trace for more detail |
| Broken links | Check My Links |
| Speed and technical | Lighthouse (or Chrome DevTools) |
| Competitor research | Similarweb and Wappalyzer |
If you are just starting, install Detailed and Keyword Surfer and stop there. Both are free and cover most of what you will check every day. Our list of the best SEO tools for beginners covers the full tools to pair them with, and the SEO audit checklist shows which checks need a crawler instead of an extension. If you work on phones as much as desktops, our mobile SEO best practices covers the checks an extension can't do. Agencies comparing a larger stack can also see our roundup of B2B SEO tools.
To turn extensions on only when you need them, use your browser's extension menu to set site access to "on click". The toolbar then loads only when you press the icon.
When you want the SEO work done, not just measured
Every extension on this list tells you what is wrong with a page or what a keyword is worth. None of them does the work. If what you actually need is more pages ranking, Distribb runs SEO for you on autopilot: connect your site and it does the keyword research, writes and publishes the articles, builds backlinks through Distribb's backlink exchange and tracks your visibility in AI search. You don't need to approve each article or have an SEO on staff. You can see how Distribb does the SEO work the toolbar only measures.
On Distribb pricing, Pro is $97 a month. Accelerator is $495 a month and adds a human reviewing every piece before it goes live. Distribb is a platform, not a bespoke creative agency, so keep your extensions for spot checks and let it handle the publishing.
FAQ
What is the best SEO browser extension?
For most people it's the Ahrefs SEO Toolbar, because it covers on-page checks, SERP country switching and redirects in one free extension. If you only want a page inspector, Detailed is cleaner and the highest-rated (4.9 in the Chrome Web Store).
What is an SEO toolbar?
An SEO toolbar is a browser extension that shows SEO data while you browse: metrics on search results, on-page elements of the page you are on, or search volume next to your searches. MozBar and SEOquake are the classic examples.
Is there an Ahrefs extension for Firefox?
Yes. The Ahrefs SEO Toolbar is on addons.mozilla.org, published by Ahrefs, and was updated in September 2026. Check the publisher name before installing, since copies exist.
Is the Ahrefs browser extension free?
Yes. The on-page report, SERP tools and redirect tracer are free, and DR and UR are free once you sign in. Full SERP metrics need a paid Ahrefs plan.
What is the best SEO toolbar for Chrome?
The Ahrefs SEO Toolbar for all-round use, SEOquake for free metrics on every result, and MozBar if you already use Moz. Pair any of them with Detailed and Keyword Surfer.
What are the best SEO extensions for Chrome?
Our shortlist: Ahrefs SEO Toolbar, Detailed SEO Extension, SEOquake, Keyword Surfer, Redirect Path, Check My Links and Lighthouse. That stack covers on-page checks, SERP metrics, volume, redirects, broken links and speed without paying for anything.
What is the best SEO toolbar for Firefox?
The Ahrefs SEO Toolbar, with Detailed, Keywords Everywhere and SEO Minion next to it. MozBar also has an up-to-date Firefox version.
Do SEO extensions slow down your browser?
Yes, especially ones that overlay data on every search result. Keep the ones you use daily always on and set the rest to run "on click".
Can a browser extension replace a full SEO tool?
No. Extensions check one page or one search at a time. For site-wide audits, rank tracking and backlink research you still need a crawler and a full SEO tool, or a platform that does the work for you.