The Complete Guide to Wappalyzer for Firefox: Installation, Use Cases, and Alternatives

What Is Wappalyzer for Firefox?

Wappalyzer is a browser extension that uncovers the technologies used on websites. Available for Firefox, Chrome, and Edge, this powerful tool detects content management systems, eCommerce platforms, web servers, JavaScript frameworks, analytics tools, and much more. For sales professionals, marketers, and developers, understanding what tech stack a website runs on is invaluable for competitive research, lead qualification, and prospecting.

The Firefox extension is particularly popular among privacy-conscious users who prefer Mozilla's browser ecosystem. With a simple click on the toolbar icon, you get instant visibility into the technologies powering any website you visit.

How to Install Wappalyzer on Firefox

Installing Wappalyzer on Firefox is straightforward and takes less than a minute:

• Step 1: Open Firefox and navigate to the Mozilla Add-ons store (addons.mozilla.org)
• Step 2: Search for "Wappalyzer" or go directly to the Wappalyzer extension page
• Step 3: Click "Add to Firefox" and confirm by selecting "Add" in the popup
• Step 4: The Wappalyzer icon will appear in your browser toolbar

Once installed, the extension runs in the background without interrupting your workflow. It only performs an analysis when you click its icon, so it won't slow down your browsing experience or consume excessive resources during normal use.

What Technologies Can Wappalyzer Detect?

Wappalyzer's detection capabilities are extensive and cover virtually every category of web technology:

• Content Management Systems: WordPress, Drupal, Joomla, Squarespace, Wix
• eCommerce Platforms: Shopify, WooCommerce, Magento, PrestaShop, BigCommerce
• Web Servers: Apache, Nginx, Microsoft IIS, LiteSpeed
• JavaScript Frameworks: React, Vue.js, Angular, jQuery, Next.js
• Analytics Tools: Google Analytics, Hotjar, Mixpanel, Amplitude
• Marketing Automation: HubSpot, Marketo, Mailchimp, ActiveCampaign
• Advertising Networks: Google Ads, Facebook Pixel, LinkedIn Insight Tag
• CDN Providers: Cloudflare, Akamai, Fastly, AWS CloudFront
• Payment Processors: Stripe, PayPal, Square, Klarna

The extension identifies these technologies by analyzing various signals including HTTP headers, meta tags, script files, cookies, and HTML patterns. This gives you a comprehensive picture of any website's technology infrastructure.

Practical Use Cases for Tech Stack Intelligence

Sales Prospecting and Lead Qualification

Understanding a prospect's tech stack is a game-changer for B2B sales. If you're selling marketing software, knowing that a company uses WordPress with WooCommerce and basic Google Analytics tells you they're probably managing their own eCommerce operation without enterprise tools—making them a prime candidate for your solution.

For example, if you're selling a Shopify app, you can use tech stack data to build a highly targeted list of Shopify stores. If you sell CRM integrations, you need to know which CRM your prospects are already using before you reach out.

Once you've identified your ideal tech stack, you'll want to find contact information for decision-makers at those companies. Our free Email Finder tool helps you locate professional email addresses using just a name and company domain, making it easy to connect with your tech-qualified leads.

Competitive Analysis

Want to know what tech your competitors are using? Wappalyzer makes competitive analysis trivially easy. Discover what analytics tools they've deployed, which marketing automation platform runs their campaigns, and what eCommerce infrastructure powers their online store.

This intelligence helps you understand their capabilities and limitations. A competitor running on Magento with custom integrations has very different operational challenges than one using Shopify with off-the-shelf apps.

Web Development Research

Developers use Wappalyzer to research how other sites are built. Curious how a fast-loading site achieves its performance? Check their CDN and caching setup. Wondering what framework powers a slick single-page application? One click tells you everything.

Wappalyzer Firefox Extension Limitations

While Wappalyzer's Firefox extension is useful for ad-hoc research, it has some significant limitations for serious prospecting work:

• One-at-a-time analysis: You can only analyze websites you're actively visiting
• No bulk processing: There's no way to analyze hundreds of websites at once
• Limited free lookups: The free tier only offers 50 technology lookups per month
• No export capabilities: The browser extension doesn't let you export data for further analysis
• Paid features are expensive: Premium plans with API access start at $250/month

For individual lookups and casual research, the free Firefox extension works great. But if you need to analyze technology at scale—identifying all companies using a specific technology, for instance—you'll need a different approach.

How to Use Tech Stack Data for Lead Generation

The real power of tech stack intelligence comes when you flip the equation: instead of checking what technologies individual websites use, you search for all websites using a specific technology. This is how technology-based lead generation actually works in practice.

Here's a concrete example. Let's say you sell a Shopify inventory management app. Your ideal customer is any Shopify store. Rather than visiting thousands of eCommerce sites one by one, you want a list of all Shopify stores in your target market.

This is exactly what Galadon's free Tech Stack Scraper does. Instead of analyzing sites one at a time, you can search for websites by the technologies they use—similar to BuiltWith but completely free for basic searches.

Building Technology-Based Prospecting Lists

Here's a practical workflow for technology-based prospecting:

1. Identify your ideal technology stack: What technologies do your best customers use? What signals buying intent for your product?
2. Build your target list: Use a tool like our Tech Stack Scraper to find companies matching your technology criteria
3. Enrich with contact data: Once you have company domains, find decision-maker emails using our Email Finder
4. Verify before sending: Always verify emails before outreach to protect your sender reputation
5. Personalize your outreach: Reference the specific technologies you detected—"I noticed you're using Shopify" is a strong opening

This approach generates highly qualified leads because you're targeting based on actual technology usage, not just firmographic data like company size or industry.

Wappalyzer Alternatives for Firefox Users

If Wappalyzer doesn't fit your needs, several alternatives exist for Firefox users:

BuiltWith

BuiltWith offers similar functionality with both a browser extension and a web-based lookup tool. Their strength is in historical data—you can see when companies adopted or removed specific technologies. However, their pricing is even higher than Wappalyzer for serious use.

Galadon Tech Stack Scraper

Our Tech Stack Scraper takes a different approach. Rather than requiring you to visit each website, you can search for websites by technology. Looking for all companies using HubSpot? Or every Magento store? The scraper returns matching results without needing to install anything in your browser.

This makes it particularly useful for building prospecting lists at scale—exactly what sales teams and recruiters need.

WhatRuns

WhatRuns is another Firefox-compatible extension that detects website technologies. It offers a clean interface and solid detection capabilities, though its database isn't as comprehensive as Wappalyzer's.

Getting More Value from Tech Stack Data

Tech stack intelligence is most valuable when combined with other prospecting data. Knowing that a company uses Salesforce is interesting; knowing who the Salesforce admin is and having their verified email makes it actionable.

That's why we built Galadon as an integrated platform. After identifying companies with your ideal tech stack, you can immediately look up contacts, find mobile numbers for direct outreach, and verify all your data before launching campaigns.

For outbound sales teams serious about technology-based prospecting, tools like Clay offer powerful data enrichment workflows that can combine tech stack data with multiple data sources. And once you have your list, platforms like Smartlead or Instantly help you send personalized cold email sequences at scale.

Common Questions About Wappalyzer for Firefox

Is Wappalyzer free to use?

The browser extension is free to install, and you get 50 free technology lookups per month. Beyond that, you'll need a paid plan, with pricing starting around $250/month for API access and lead list features.

Does Wappalyzer slow down Firefox?

Generally no. The extension only analyzes a page when you click its icon, so it doesn't impact normal browsing performance. If you have many extensions installed, you might notice some slowdown, but Wappalyzer itself is lightweight.

Can Wappalyzer detect all technologies?

No technology detection tool is 100% accurate. Wappalyzer detects thousands of technologies based on known patterns, but custom-built solutions or heavily modified platforms may not be identified correctly. The detection database is community-driven and regularly updated.

Is the data accurate?

Wappalyzer's accuracy is generally good for well-known technologies. However, it can only detect what's visible from the frontend—backend technologies that don't expose signatures won't be detected. Always validate critical data points before making business decisions.

Getting Started with Technology-Based Prospecting

If you're new to using tech stack data for lead generation, start simple:

1. Install Wappalyzer on Firefox for ad-hoc research on individual websites
2. Analyze your existing customers to identify common technology patterns
3. Define your ideal technology profile based on what your best customers use
4. Use a bulk tool like our Tech Stack Scraper to find more companies matching that profile
5. Build and verify your contact list before launching outreach

Technology-based prospecting consistently outperforms traditional methods because you're reaching out to companies that are actually using—and therefore already value—solutions like yours. That relevance dramatically improves response rates and conversion.

Whether you stick with Wappalyzer's Firefox extension for casual research or level up to bulk tools for serious lead generation, understanding your prospects' tech stack is now table stakes for B2B sales.