addons.mozilla.org Website Overview & Technology Report
🤖 AI Summary
We performed a comprehensive analysis of addons.mozilla.org on 2026-06-27. The website returned an HTTP 200 status code with a server response time of 12691ms. The page is served over HTTP/2 protocol with Gzip compression enabled, achieving approximately 60.0% size reduction. The total page weight is 306 KB, and the site is served behind a CDN (Content Delivery Network).
Warning: The website does not have a valid SSL certificate. Visitors may see security warnings in their browser, and data transmitted to and from this website is not encrypted.
The security headers analysis reveals a score of 70/100 (good). The following security headers are properly configured: Content-Security-Policy, Strict-Transport-Security (HSTS), X-Frame-Options, and X-Content-Type-Options. However, the site is missing Referrer-Policy and Permissions-Policy, which could expose the site and its users to cross-site scripting (XSS), clickjacking, and other web-based attacks.
Our technology detection scan identified 5 technologies across 5 categories powering addons.mozilla.org. The detected stack includes Angular, React, Google Tag Manager, GitHub Pages, and YouTube Embed. The site uses Angular as its primary framework. The UI is built with React.
Based on our comprehensive analysis of domain age, SSL configuration, email authentication, security headers, and blacklist status, addons.mozilla.org receives an overall trust score of 67/100, classified as "Likely Safe".
HTTP Response
Status200 OK
Response Time12691ms
ProtocolHTTP/2
Page Size306 KB
CompressionGzip
Compression Savings~60.0%
CDNYes ✓
Server—
Total Requests173
3rd Party Domains14
Redirect1 hop(s)
Detected Technologies (5)
🔧 Angular
⚛️ React
🏷️ Google Tag Manager
🖥️ GitHub Pages
🎬 YouTube Embed
Security Headers
✓
Content-Security-Policy
Set ✓
✓
Strict-Transport-Security (HSTS)
Set ✓
✓
X-Content-Type-Options
Set ✓
✗
Referrer-Policy
Not set
✗
Permissions-Policy
Not set
SSL Certificate
IssuerLet's Encrypt
Issuer FullcountryName=US, organizationName=Let's Encrypt, commonName=YR1
SubjectcommonName=addons.mozilla.org
Type—
TLS VersionTLS 1.3
Cipher SuiteTLS_AES_128_GCM_SHA256
Algorithm—
Issued—
Expires— (? days)
SANs—
addons.mozilla.org Trust Score & Safety Analysis
🤖 AI Summary
After conducting a thorough safety and legitimacy analysis, addons.mozilla.org receives a trust score of 67/100, which places it in the "Likely Safe" category. This score is calculated by evaluating multiple factors including SSL certificate validity, domain registration history, email authentication protocols, security header configuration, and blacklist status across major threat intelligence databases.
The analysis identified several positive trust signals: a valid HTTPS connection protecting data in transit and HSTS (HTTP Strict Transport Security) enforcement preventing protocol downgrade attacks.
Areas of concern include: missing Referrer-Policy, potentially leaking URL information to third parties, the domain's WHOIS information is hidden behind a privacy service, making it harder to verify the owner's identity, and DNSSEC is not enabled, leaving DNS queries vulnerable to spoofing attacks. While these issues don't necessarily indicate malicious intent, they represent areas where the website's security posture could be improved.
We checked addons.mozilla.org against 8 major blacklist databases including Google Safe Browsing, Phishtank, Urlhaus, Openphish, Dnsfilter, Spamhaus Dbl, Surbl, and Virustotal. The domain passed all 8 checks with a clean status, meaning it has not been flagged for phishing, malware distribution, spam, or other malicious activities by any of the tested threat intelligence providers.
Trust Signals
✅ Valid HTTPS
✅ HSTS enabled
⚠️ DNSSEC not enabled
✅ Sitemap.xml found
✅ Robots.txt found
⚠️ Missing Referrer-Policy
Blacklist Checks (8/8 clean)
✓
Google Safe Browsing
clean
✓
Phishtank
clean
✓
Urlhaus
clean
✓
Openphish
clean
✓
Dnsfilter
clean
✓
Spamhaus Dbl
clean
✓
Surbl
clean
✓
Virustotal
clean
addons.mozilla.org Technology Stack & Detected Technologies
🤖 AI Summary
Our technology detection engine scanned addons.mozilla.org and identified 5 distinct technologies across 5 categories. This analysis is performed by examining HTTP response headers, HTML source code patterns, JavaScript library fingerprints, CSS framework signatures, and DNS records.
Framework: Angular — provides the application framework and routing for addons.mozilla.org.
UI Library: React — handles the user interface rendering and component management for addons.mozilla.org.
Tag Manager: Google Tag Manager — manages marketing and analytics tags without code changes for addons.mozilla.org.
Hosting: GitHub Pages — provides the server infrastructure for addons.mozilla.org.
Video: YouTube Embed — provides video hosting and playback for addons.mozilla.org.
We also extracted the following tracking identifiers: Google Tag Manager container GTM-WVHFHF6. These IDs can be used to identify other websites operated by the same organization.
Framework
UI Library
Tag Manager
🏷️ Google Tag Manager(95%)
Hosting
Video
Tracking IDs
addons.mozilla.org Performance, Speed & Core Web Vitals
🤖 AI Summary
addons.mozilla.org delivers its homepage in 12691ms (server response time), which is considered slow by industry standards. The total page weight is 306 KB, and we detected 173 resource requests loading assets from 14 third-party domains. A high number of third-party domains can significantly impact page load time due to additional DNS lookups and TLS handshakes required for each domain.
The website uses Gzip compression for text-based assets, achieving an estimated 60.0% reduction in transfer size. This reduces bandwidth usage and improves page load times, especially for visitors on slower connections.
Asset minification status: 0 out of 1 CSS files and 0 out of 2 JavaScript files are minified. Minifying the remaining 3 unminified file(s) could further reduce page weight by 10-30% for those assets. Minification is a best practice that reduces download sizes without affecting functionality.
The site is served through a Content Delivery Network (CDN), which caches static assets at edge servers around the world. This means visitors from different geographic regions receive content from the nearest edge server, significantly reducing latency. CDN usage is particularly important for websites with a global audience, as it can reduce page load times by 40-60% for distant visitors.
From an environmental perspective, each page view of addons.mozilla.org produces approximately 0.15g of CO₂, earning a carbon rating of A. This places the website among the cleanest on the web, demonstrating efficient use of server resources and optimized content delivery. For reference, the average web page produces about 0.5g of CO₂ per page view. The page weight of 306 KB is the primary factor in this calculation.
Core Web Vitals data from the Chrome User Experience Report (CrUX) is not available for addons.mozilla.org. This typically means the site doesn't have enough real-world Chrome user traffic to generate statistically significant field data, or the domain is not included in the CrUX dataset. Core Web Vitals (LCP, INP, CLS) are important Google ranking factors that measure real user experience.
Core Web Vitals data not available
Requires CrUX API key configuration
Carbon Footprint
CO₂ per page view0.15g
RatingA
Page Weight & Optimization
HTML Size306 KB
CompressionGzip
Compression Savings~60.0%
CDNYes ✓
Total Requests173
3rd Party Domains14
CSS Minified0/1
JS Minified0/2
addons.mozilla.org DNS Records, Email Authentication & Domain Registration
🤖 AI Summary
addons.mozilla.org resolves to the IPv4 address 151.101.65.91 and also supports IPv6 (2a04:4e42:200::347), demonstrating modern network infrastructure readiness. The domain has 4 A record(s) configured.
The domain name system is managed by 4 name servers: ns-1140.awsdns-14.org, ns-144.awsdns-18.com, ns-1696.awsdns-20.co.uk, and ns-967.awsdns-56.net. Having 4 name servers provides good redundancy — if one fails, the others can continue serving DNS queries. The choice of name servers often indicates the DNS hosting provider or CDN service being used.
Email for addons.mozilla.org is handled by socketlabs.com with 1 MX records configured: mx.socketlabs.com. Multiple MX records provide failover redundancy — if the primary mail server is unavailable, email will be routed to the next available server.
SPF is not configured, meaning any server could potentially send emails pretending to be from this domain. This is a significant email security concern. DMARC is not configured, leaving the domain vulnerable to email spoofing and phishing attacks that impersonate this domain. DKIM was not detected. Without DKIM, recipients cannot cryptographically verify that emails claiming to be from this domain are authentic.
DNSSEC is not enabled for addons.mozilla.org. While not critical for most websites, DNSSEC adds an important security layer by ensuring DNS responses haven't been tampered with during transit. Enabling DNSSEC is recommended for domains handling sensitive data or financial transactions.
DNS Records
A
151.101.65.91
151.101.193.91
151.101.129.91
151.101.1.91
NS
ns-1140.awsdns-14.org
ns-144.awsdns-18.com
ns-1696.awsdns-20.co.uk
ns-967.awsdns-56.net
Email & Authentication
MX Providersocketlabs.com
Registrar—
Organisation—
Country—
Contact—
Registered—
Expires—
Domain Age—
IPv6 SupportYes ✓
addons.mozilla.org Page Content, Images & Accessibility
🤖 AI Summary
The homepage of addons.mozilla.org contains 970 words of visible text content. This is a moderate amount of content. The page is structured with 29 H2 headings, 49 H3 headings, 6 H4 headings.
The page includes 30 images. 1 images (3%) are missing alt text attributes, which is a significant concern for both accessibility and SEO. Screen readers rely on alt text to describe images to visually impaired users, and search engines use alt text to understand image content. Only 97% of images have proper alt text — we recommend adding descriptive alt attributes to all images.
The link structure consists of 62 internal links pointing to other pages on the same domain and 30 external links pointing to third-party websites. There are 2 external JavaScript files, 1 CSS stylesheets, and 0 iframes on the page.
The site implements the following web standards and features: XML Sitemap (helps search engines discover all pages) and robots.txt (controls search engine crawling behavior).
Notable missing features: Schema.org structured data. Adding these could improve search engine discoverability and rich result eligibility.
We detected the following payment methods accepted on addons.mozilla.org: Discover. Offering multiple payment options including credit cards and digital wallets improves customer trust and can increase conversion rates.
The website has social media presence across 4 platforms: Twitter (@thanks), Instagram (@firefox), Youtube (@firefox), and Tiktok (@firefox). An active social media presence is a positive trust indicator and helps build brand awareness and customer engagement.
Content Structure
H1Firefox Browser Add-ons
H2 Tags29
H3 Tags49
H4 Tags6
H5 Tags0
H6 Tags0
Internal Links62
External Links30
Assets & Features
JavaScript Files2
JS Minified0/2
CSS Files1
CSS Minified0/1
Iframes0
Images30
Missing Alt1
SitemapYes ✓
Robots.txtYes ✓
PWANo
AMPNo
RSS FeedNo
Payment Methods Detected
Social Media Presence
Twitter: @thanksInstagram: @firefoxYoutube: @firefoxTiktok: @firefox
addons.mozilla.org SEO Analysis, Meta Tags & Open Graph
🤖 AI Summary
The title tag for addons.mozilla.org is good at 27 characters: "Add-ons for Firefox (en-US)". The length is acceptable, though it may be slightly truncated in some search result displays.
The meta description is 160 characters (acceptable): "Download Firefox extensions and themes. They’re like apps for your browser. They can block annoying ads, protect passwor...". Google typically displays up to 155-160 characters of the meta description in search results. A compelling meta description with a clear call-to-action can significantly improve click-through rates from search results.
The canonical url is correctly set to https://addons.mozilla.org/en-us/firefox/, preventing duplicate content issues, the page language is declared as en-us, and a favicon is configured.
Open Graph meta tags are configured with 4/4 recommended fields: OG title ("Add-ons for Firefox (en-US)..."), OG description, OG image (social sharing thumbnail), OG type (website). These tags control how the page appears when shared on Facebook, LinkedIn, and other social media platforms that support the Open Graph protocol.
Google SERP Preview
Add-ons for Firefox (en-US)
https://addons.mozilla.org
Download Firefox extensions and themes. They’re like apps for your browser. They can block annoying ads, protect passwords, change browser appearance, and more.
Meta Tags
TitleAdd-ons for Firefox (en-US)...
Title Length27 chars
Meta Desc Length160 chars
H1Firefox Browser Add-ons
Languageen-US
Canonicalhttps://addons.mozilla.org/en-US/firefox/
Meta Robotsnot set
Meta Keywordsnot set
Schema.org & Social
Schema Types—
OG Typewebsite
OG ImageSet ✓
Twitter Card—
FaviconSet ✓
Open Graph Preview
addons.mozilla.org
Add-ons for Firefox (en-US)
Download Firefox extensions and themes. They’re like apps for your browser. They can block annoying ads, protect passwords, change browser appearance, and more.
addons.mozilla.org Related Domains & Cross-References
🤖 AI Summary
Related domain discovery works by finding other websites that share the same IP address, Google Tag Manager container ID, Google Analytics property, or advertising pixel IDs with addons.mozilla.org. This data becomes available after batch-crawling the domain database — individual domain lookups cannot populate this section. We extracted the following tracking IDs that can be used for cross-referencing: gtm_id: GTM-WVHFHF6.
Tracking IDs for Cross-Referencing
Related Domains
Related domain data requires database (populated after batch crawl)