Mozilla Firefox is a popular web browser with a loyal userbase.

It also rocks an awesome fox icon and comes with a bucketload of extensions that are like apps for your browser.

Well, how about we add some fire to your fox with the best SEO extensions for Firefox?

These add-ons will make you a quicker, smarter search engine optimizer.

Sound good?

Of course, with so many to choose from, which SEO extensions do you actually need?

To save you time, I have hand-selected only the best add-ons to cover the broadest, most popular tasks a modern SEO needs.

The Top Extensions for Firefox: A Curated Selection

The Firefox SEO extensions below cover a lot of ground for carrying out the tasks that matter most.

While this is not a big number, you don’t need a lot of add-ons to do good SEO work. And with fewer installed, your browser will run more fox-like, too, just as it should.

Here they are:

  1. Detailed SEO Extension
  2. Keywords Everywhere
  3. SEOquake
  4. Hunter: Find email addresses in seconds

You can do amazing things with only these four add-ons.

Psst: After we finish looking at these four, I am going to shine a light on a few more extensions worthy of your attention. That’s a promise.

OK. Read on to see how these four cut through the competition to earn the best-of title.

The Best Firefox Extension for On-Page SEO Analysis

A 30,000-foot view of search engine optimization reveals two broad categories:

  1. On-page / On-site SEO;
  2. Off-page / Off-site SEO

With on-page SEO, you are dealing with all the parts that make up the web page itself, including the visible content your browser displays, and the invisible elements in the HTML source code.

And there’s a lot to dig into here.

Thankfully, with the right Firefox extension, you can intelligently carry out traditional on-page SEO analysis in a snap.

And that’s the point.

To perform quick, useful analysis.

And on Firefox they don’t get any better than:

The Detailed SEO Extension

The Detailed SEO Extension by is a delightful add-on for Firefox.

It is 100% free and has no ads. And while many of the top extensions in this space are only available for the Google Chrome browser, has not left the Firefox fans wanting.

The Detailed SEO extension delivers meaningful page-level insights at the click of a button, saving you from hunting through the source code—a must-have for any discerning Firefox fan.

Let’s look at what you can do with the Detailed SEO Extension:

  • Get a quick snapshot of the meta title, meta description, page URL, and check if a canonical URL tag was set (and confirm if it is self-referencing or not);
  • Inspect the contents of the robots meta tag and the harder to spot X-Robots-Tag (the kind specified in the HTTP header) to see what —if any— indexing instructions are set (essential information for the professional SEO);
  • Instantly eye-ball every header tag on the page, from H1s to H6s in the order they occur, all lovingly indented with different font sizes for ease of understanding (handy for swift content structure analysis)
  • Get a quick link audit of the page: see how many are unique, internal, and external, along with a “print-out” of every link including its anchor text (with options to export);
  • See a total image count with a breakdown of how many are missing the “alt tag” and the” title tag” (with options to export both the complete and incomplete images);
  • Easily view schema microdata (yes, not only does this SEO extension dig up and report the critical HTML tags, it now shows you the Schema data, too);
  • Quickly view the content placed inside the social tags on the page

Yes, that is a lot of SEO data to drink-in.

But it never feels like you are drinking from a firehose, which is one of the charms of this Detailed SEO browser add-on: it makes the complex genuinely accessible and enjoyable to use.

Oh, and one last trick worth mentioning is found in the Quick Links tab.

Here you will find:

  1. Quick links to many of the popular SEO services where you can carry out more in-depth SEO analysis on the website you are on;
  2. A couple of Google search queries that are useful when auditing a website: the first query performs a Google site search to see all indexed pages, while the second query looks for URLs that are not secure or which should not be indexed at all (perhaps);
  3. A handy “highlight nofollow links” option which will highlight any rel= “nofollow” links on the page

It is incredible what you can dig up in a few seconds with the right tool.

The Best SEO Extension for Keyword Research

What people search for, and how often, are fundamental questions for an SEO.

It would be a mistake to gloss over the importance of keyword research.

First, the more we know and understand the phrases an audience use to search with, the better we can relate and map our pages to said searches.

Second, keyword research is how we unearth new content ideas to cover the gaps unwittingly left to our competitors.

Third, keyword research can lead to uncovering new and exciting niches to enter.

Yes, keywords are the key to so many things. And with the right Firefox extension, it only becomes quicker and easier to do.

Keywords Everywhere

The Keywords Everywhere extension is a freemium add-on and one of the best for carrying out keyword research in your browser.

It is regularly updated and has a lot of fans in the world of SEO.

For free users, here is what Keywords Everywhere will do for you:

  1. When searching in Google, this add-on will show you the “Related Keywords” to your current search query, along with an option to export those results to CSV;
  2. Also in Google, you get a list of “People Also Search For” keywords immediately below the related keywords (with the option to export to CSV);
  3. In Bing, you get a list of “Related Keywords” as you search;
  4. You can also quickly carry out a keyword density analysis for the page you are on which includes details like where the words are found on the page (e.g., in the Title, Description, the Headers, etc.)

For paid users, Keywords Everywhere will also report the monthly search volume, CPC (cost-per-click), and competition data for each keyword.

But wait, there’s more.

Amazingly, this extension will also import this data into your favorite keyword research platforms as you browse around the web, including:

  • Google Search Console;
  • Google Analytics;
  • Google Trends;
  • Google Keyword Planner;
  • YouTube;
  • Amazon;
  • eBay;
  • Etsy;
  • Answer The Public;
  • Soovle;
  • Keyword Shitter;
  • Majestic;
  • Moz Open Site Explorer

The idea here is to reduce your time spent digging up data on the keywords you already have in front of you when using the many services above.


It is genuinely smart how this data gets sprinkled into the interface of popular websites like Amazon, eBay, and so on, all while you browse.

While not free, their pricing is more than reasonable. There are no monthly subscriptions. Keywords Everywhere use a pay-as-you-go credit system where 1 Credit = 1 Keyword.

At the time of writing, $10 buys you 100,000 credits, which should easily last most people a few months.

The Best Firefox Extension for Off-Page Analysis

“Off-page SEO” refers to all those rank-boosting factors and signals which do not originate from the page itself.

These are the various popularity signals we most commonly associate with backlinks, although there are other ways to communicate these signals (a topic for another day.)

While researching the available SEO add-ons for Firefox, I found the choice for off-site research and analysis to be a little underwhelming.

If you happen to have a paid account with Ahrefs —a popular SEO and competitor research tool— you can install their extension to bring those juicy metrics right to your browser.

A reliable option which I’ll talk more about later in my “Also Worth-A-Look” list, below.

But if you don’t use Ahrefs?

Fear not! Because there is an option for you that is free and can handily assist you in comparing the off-site signals for any given URL.

With this Firefox extension, you can compare your competitors in a useful way.

Let’s look at that now:


It seems no best-of list is complete without SEOquake.

This is a heavyweight SEO extension with almost too many features. But, with careful curation (which I’ll get to), this tool won’t overwhelm you and becomes rather useful for off-site metrics.

It turns out SEOquake is quite handy for doing quick competitor analysis while browsing the SERPs (search engine results page.)

Now, this is a highly-configurable extension, and I recommend taking advantage of that to filter out the data you don’t need to streamline your workflow.

For example, I only enable the following options under “Parameters” to keep me focused:

  • SEMrush backlinks: the number of backlinks found pointing to the specific URL;
  • Webarchive age: to give me a quick idea of the potential age of the website;
  • SEMrush SE Traffic: to provide me with an estimate of the total monthly traffic for each site

I also leave the “Domain Trust metrics” enabled. This gives two additional metrics to compare:

  1. Domain Score: a measure of the importance of the domain on a 100 point scale, based on the number of links pointing to the domain;
  2. Trust Score: a measure of how trustworthy the domain is, also on a 100 point scale, but this time based on the number of links coming from trusted, high-quality websites

These two scores are useful because when there is a big difference, it means there is a more significant number of low-quality links than high (a disproportionate amount.)

Of course, all of these values are only to taken as a guideline.

Use the metrics to benchmark your competitor’s relative SEO strength against each other (and yourself.)

These figures give you a reference point to judge comparative off-site signals to help you analyze your search landscape.

It is also worth mentioning that directly under the search field, you will find a “Keyword difficulty” score for the current query.

The keyword difficulty score is a 0-100% number, where 100% is the most difficult.

Naturally, it is tough to calculate the actual difficulty of ranking for a keyword as there are too many variables.

However, as a reference point, the scores provided by SEMrush are useful to compare keywords as you search.

Of course, while researching websites, you may find a few you would like to reach out to and begin a relationship with.

After all, if you want to increase the off-site signals for your —or your clients— website, earning a mention or guest post could be just the ticket.

With that in mind, let’s quickly switch gears and look at a great Firefox extension for assisting with outreach efforts.

Hunter: Find email addresses in seconds

Hunter offers one of the most accurate services on the web for finding the contact details behind a website.

With the Hunter Firefox extension installed, you get easy access to their excellent service right where you need it: your browser.

Clicking on the Hunter icon pops up a box with a list of:

  1. Names;
  2. Email addresses;
  3. Job titles;
  4. Phone numbers;
  5. Social media accounts

Of course, Hunter can only show you the data they have. In most cases, you should easily find the contact names and email addresses.

Tip: for the social media accounts, look for the tiny social icons next to the name (if found.) They are easy to miss at first glance.

For each email address:

  • A green shield means it is a verified address;
  • If not verified, Hunter will give you a confidence score;
  • Click on the checkmark icon to ask Hunter to check the email address (if not showing as verified)

Hunter gives you 50 free searches a month.

While other services compete in the same space, accuracy will vary between them.

Also Worth-A-Look: Other Top SEO Extensions

The SEO extensions above may well be all you need to handle 80% of your day-to-day SEO requirements.

But even so, there are plenty of other add-ons that are worth a look.

For example:

  1. Broken Link Checker
  2. Link Gopher
  3. Link Redirect Trace
  4. SEO Analysis & Website Review by WooRank
  5. Ahrefs SEO Toolbar

Let’s take a closer look at these now.

This simple Firefox extension checks the page for broken links.

One-click and up pops a box, which then automatically begins searching through the links.

Right away, you can see if you have any broken links.

Next to each link is an “inspect “button. Clicking it will highlight the link on the page to aid in finding it.

Not the most sophisticated or attractive tool, but it does the job quickly and without fuss.

The Link Gopher is a nice little add-on that extracts the links from the page you are on.

Choose “extract all,” and the Link Gopher will dump all the links into a new tab. And handily, the links are hyperlinked, too.

You can also choose to “extract links by filter,” which gives you a simple way to extract only the links that contain a word or character-string you specify (e.g., you might want only to grab the links which contain the name “red”).

Link Redirect Trace performs a critical technical SEO job: To check for link redirect issues and track HTTP header activity.

Install this add-on and use it to:

  • Reveal every link redirect hop;
  • Quickly spot potential indexing issues on each level of redirect;
  • Confirm the redirect type (302, 301, etc.) is the type you want

This is a must-have for technical SEOs.

SEO Analysis & Website Review by WooRank

The WooRank SEO extension carries out a mini SEO audit of the web page you are on.

It aims to be comprehensive and does cover a lot of ground.

This all-in-one SEO extension checks and returns a score for a multitude of factors, including:

  • On-page content elements, metatags, structured data, usability, and mobile-friendliness, etc.;
  • Indexing checks, sitemap validity, and broken links and more;
  • Security, performance checks, and the technologies in use;
  • Backlink scores and traffic estimations;
  • Social profiles linked to the website

The WooRank SEO Extension does a lot, so if you are looking for an all-in-one SEO audit tool, this is for you.

Ahrefs SEO Toolbar

If you have a paid account with Ahrefs, then you will be delighted to know they provide a complementary Firefox add-on.

With the Ahrefs SEO Toolbar installed and hooked up to your account, you benefit from getting their rich metrics displayed right in your browser.

Very useful for quick access to both page and domain metrics like:

  • Domain Rating (DR);
  • URL Rating (UR);
  • Number of referring domains (RD);
  • Number of backlinks (BL)

The toolbar will also show you Ahrefs “Keyword Difficulty” (KD) along with search volume and cost-per-click (CPC) figures.

Action Steps

In truth, if you are starting from zero you can’t go wrong installing just these Firefox SEO add-ons:

  1. Detailed SEO Extension
  2. Keywords Everywhere
  3. SEOquake
  4. Hunter: Find email addresses in seconds

These four will get you up and running, and they are some of the best extensions you will find for everyday SEO tasks.

Plug them into your browser, and you will find it pleasant and enjoyable to do your SEO research day-to-day. After all, you will only have to juggle four icons in your toolbar!


Search engines like Google look for signals across the web to help them determine relevance, authority, and usefulness for any given web page.

That means the closer you can reflect the signals Google is looking for, the better your results will be.

The SEO extensions listed above are there to help you do just that.

And you don’t need to be an expert in search engine optimization to benefit from them!

Using the right tools, you can reverse engineer what is already working well to find clues.

And you can check for problems that may exclude a page from ranking at all.

All you need is a modern web browser —like Firefox— armed with a smart selection of SEO extensions, and you are good to go.

Have fun!