#### #### ##### #### #### ####### #### ### #### ######### #### ###### #### ###### #### ###################### ##### #### ####### ####### ##### #### ####### ####### # #### ###################### #### #### ###### #### #### #### ## #### #### #### #### ################## #### #### ################## ================================================== # SiteOne Crawler, v2.1.0.20260317 # # Author: jan.reges@siteone.cz # ================================================== Detected terminal width 138 < 140 chars - compact mode activated. URL | Status | Type | Time | Size | Cache | Access. | Best pr. ------------------------------------------------------------------------------------------------------------------------------------ /en-US/docs/Mozilla/Firefox | 200 | HTML | 216 ms | 150 kB | 60 min | 1/3/2 | 7 Skipped URLs Summary -------------------- Reason | Domain | Unique URLs -------------------------------------------------------------------- Not allowed host | www.mozilla.org | 6 Not allowed host | www.firefox.com | 4 Not allowed host | github.com | 4 Not allowed host | firefox-source-docs.mozilla.org | 2 Not allowed host | extensionworkshop.com | 1 Not allowed host | foundation.mozilla.org | 1 Not allowed host | mastodon.social | 1 Not allowed host | whattrainisitnow.com | 1 Not allowed host | hg-edge.mozilla.org | 1 Not allowed host | scrimba.com | 1 Not allowed host | hacks.mozilla.org | 1 Not allowed host | support.mozilla.org | 1 Not allowed host | x.com | 1 Not allowed host | groups.google.com | 1 Skipped URLs ------------ Reason | Skipped URL | Source | Found at URL ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ Not allowed host | https://extensionworkshop.com/documentation/themes | | /en-US/docs/Mozilla/Firefox Not allowed host | https://firefox-source-docs.mozilla.org/ | | /en-US/docs/Mozilla/Firefox Not allowed host | https://firefox-source-docs.mozilla.org/…ributing/index.html | | /en-US/docs/Mozilla/Firefox Not allowed host | https://foundation.mozilla.org/ | | /en-US/docs/Mozilla/Firefox Not allowed host | https://github.com/mdn | | /en-US/docs/Mozilla/Firefox Not allowed host | https://github.com/mdn/ | | /en-US/docs/Mozilla/Firefox Not allowed host | https://github.com/mdn/content/issues/ne…%0A%3C%2Fdetails%3E | | /en-US/docs/Mozilla/Firefox Not allowed host | https://github.com/orgs/mdn/discussions/739 | | /en-US/docs/Mozilla/Firefox Not allowed host | https://groups.google.com/a/mozilla.org/g/firefox-dev | | /en-US/docs/Mozilla/Firefox Not allowed host | https://hacks.mozilla.org/ | | /en-US/docs/Mozilla/Firefox Not allowed host | https://hg-edge.mozilla.org/mozilla-central/ | | /en-US/docs/Mozilla/Firefox Not allowed host | https://mastodon.social/@mdn | | /en-US/docs/Mozilla/Firefox Not allowed host | https://scrimba.com/frontend-path-c0j?via=mdn-learn-navbar | | /en-US/docs/Mozilla/Firefox Not allowed host | https://support.mozilla.org/products/mdn-plus | | /en-US/docs/Mozilla/Firefox Not allowed host | https://whattrainisitnow.com/calendar/ | | /en-US/docs/Mozilla/Firefox Not allowed host | https://www.firefox.com/en-US/ | | /en-US/docs/Mozilla/Firefox Not allowed host | https://www.firefox.com/en-US/channel/desktop/ | | /en-US/docs/Mozilla/Firefox Not allowed host | https://www.firefox.com/en-US/channel/desktop/developer/ | | /en-US/docs/Mozilla/Firefox Not allowed host | https://www.firefox.com/en-US/download/all/ | | /en-US/docs/Mozilla/Firefox Not allowed host | https://www.mozilla.org/ | | /en-US/docs/Mozilla/Firefox Not allowed host | https://www.mozilla.org/about/governance…cies/participation/ | | /en-US/docs/Mozilla/Firefox Not allowed host | https://www.mozilla.org/about/legal/terms/mozilla | | /en-US/docs/Mozilla/Firefox Not allowed host | https://www.mozilla.org/en-US/careers/listings/ | | /en-US/docs/Mozilla/Firefox Not allowed host | https://www.mozilla.org/en-US/privacy/we…s/data-preferences/ | | /en-US/docs/Mozilla/Firefox Not allowed host | https://www.mozilla.org/privacy/websites/ | | /en-US/docs/Mozilla/Firefox Not allowed host | https://x.com/mozdevnet | | /en-US/docs/Mozilla/Firefox External URLs ------------- External URL | Pages | Found on URL (max 5) ------------------------------------------------------------------------------------------------------------------------------------- https://extensionworkshop.com/documentation/themes | 1 | /en-US/docs/Mozilla/Firefox https://firefox-source-docs.mozilla.org/ | 1 | /en-US/docs/Mozilla/Firefox https://firefox-source-docs.mozilla.org/…ributing/index.html | 1 | /en-US/docs/Mozilla/Firefox https://foundation.mozilla.org/ | 1 | /en-US/docs/Mozilla/Firefox https://github.com/mdn | 1 | /en-US/docs/Mozilla/Firefox https://github.com/mdn/ | 1 | /en-US/docs/Mozilla/Firefox https://github.com/mdn/content/issues/ne…%0A%3C%2Fdetails%3E | 1 | /en-US/docs/Mozilla/Firefox https://github.com/orgs/mdn/discussions/739 | 1 | /en-US/docs/Mozilla/Firefox https://groups.google.com/a/mozilla.org/g/firefox-dev | 1 | /en-US/docs/Mozilla/Firefox https://hacks.mozilla.org/ | 1 | /en-US/docs/Mozilla/Firefox https://hg-edge.mozilla.org/mozilla-central/ | 1 | /en-US/docs/Mozilla/Firefox https://mastodon.social/@mdn | 1 | /en-US/docs/Mozilla/Firefox https://scrimba.com/frontend-path-c0j?via=mdn-learn-navbar | 1 | /en-US/docs/Mozilla/Firefox https://support.mozilla.org/products/mdn-plus | 1 | /en-US/docs/Mozilla/Firefox https://whattrainisitnow.com/calendar/ | 1 | /en-US/docs/Mozilla/Firefox https://www.firefox.com/en-US/ | 1 | /en-US/docs/Mozilla/Firefox https://www.firefox.com/en-US/channel/desktop/ | 1 | /en-US/docs/Mozilla/Firefox https://www.firefox.com/en-US/channel/desktop/developer/ | 1 | /en-US/docs/Mozilla/Firefox https://www.firefox.com/en-US/download/all/ | 1 | /en-US/docs/Mozilla/Firefox https://www.mozilla.org/ | 1 | /en-US/docs/Mozilla/Firefox https://www.mozilla.org/about/governance…cies/participation/ | 1 | /en-US/docs/Mozilla/Firefox https://www.mozilla.org/about/legal/terms/mozilla | 1 | /en-US/docs/Mozilla/Firefox https://www.mozilla.org/en-US/careers/listings/ | 1 | /en-US/docs/Mozilla/Firefox https://www.mozilla.org/en-US/privacy/we…s/data-preferences/ | 1 | /en-US/docs/Mozilla/Firefox https://www.mozilla.org/privacy/websites/ | 1 | /en-US/docs/Mozilla/Firefox https://x.com/mozdevnet | 1 | /en-US/docs/Mozilla/Firefox Redirected URLs --------------- No redirects found. 404 URLs -------- No 404 URLs found. SSL/TLS info ------------ Info | Text --------------------------------------------------------------------------------------------------------------------------------------- Issuer | C = US, O = Let's Encrypt, CN = R12 Subject | CN = developer.mozilla.org Valid from | Feb 7 13:57:58 2026 GMT (VALID already 45 day(s)) Valid to | May 8 13:57:57 2026 GMT (VALID still for 45 day(s)) Supported protocols | TLSv1.2, TLSv1.3 RAW certificate output | Certificate: Data: Version: 3 (0x2) Serial Number:…7:e2:43:e4:87: 31:9d:67:3c RAW protocols output | === ssl2 === s_client: Unknown option: -ssl2 s_client: Use -help for su…Early Data: 8192 --- read R BLOCK TOP fastest URLs ---------------- Time | Status | Fast URL ------------------------------------------------------------------------------------------------------------------------------------------ 216 ms | 200 | /en-US/docs/Mozilla/Firefox TOP slowest URLs ---------------- Time | Status | Slow URL ------------------------------------------------------------------------------------------------------------------------------------- 216 ms | 200 | /en-US/docs/Mozilla/Firefox SEO metadata ------------ This table contains large data and shows max 10 rows. To see them all, use output to HTML using `--output-html-report=tmp/myreport.html`. URL | Indexing | Title | H1 | Description | Keywords --------------------------------------------------------------------------------------------------------------------------------------- /en-US/docs/Mozilla/Firefox | Allowed | Firefox…MDN | Firefox | Firefox…rs. | OpenGraph metadata ------------------ This table contains large data and shows max 10 rows. To see them all, use output to HTML using `--output-html-report=tmp/myreport.html`. URL | Twitter Title | Twitter Description | Twitter Image ----------------------------------------------------------------------------------------------------------------------------------------- /en-US/docs/Mozilla/Firefox | | | Heading structure ----------------- This table contains large data and shows max 10 rows. To see them all, use output to HTML using `--output-html-report=tmp/myreport.html`. Heading structure | Count | Errors | URL ----------------------------------------------------------------------------------------------------------------------------------------

Firefox

In this article

Key resources [#k…elp improve MDN [#feedback] | 12 | 0 | /en-US/docs/Mozilla/Firefox HTTP headers ------------ Header | Occurs | Unique | Values preview | Min value | Max value ------------------------------------------------------------------------------------------------------------------------------------- Accept-Ranges | 1 | 1 | bytes | | Age | 1 | - | [ignored generic values] | 0 sec(s) | 0 sec(s) Cache-Control | 1 | 1 | public, max-age=3600 | | Content-Security-Policy | 1 | 1 | default-src 'self'; script-src '…ker-src 'self'; | | Content-Type | 1 | 1 | text/html | | Date | 1 | - | [ignored generic values] | 2026-03-24 | 2026-03-24 Etag | 1 | - | [ignored generic values] | | Expires | 1 | - | [ignored generic values] | 2026-03-24 | 2026-03-24 Last-Modified | 1 | - | [ignored generic values] | 2026-03-24 | 2026-03-24 Referrer-Policy | 1 | 1 | strict-origin-when-cross-origin | | Server | 1 | 1 | Google Frontend | | Strict-Transport-Security | 1 | 1 | max-age=63072000 | | Vary | 1 | 1 | Accept-Encoding | | Via | 1 | 1 | 1.1 google, 1.1 varnish, 1.1 var…sh, 1.1 varnish | | X-Cache | 1 | 1 | MISS, HIT, MISS | | X-Cache-Hits | 1 | 1 | 0, 24, 0 | | X-Cloud-Trace-Context | 1 | 1 | e899116c786f6143b99c7e8ff9df19e6 | | X-Content-Type-Options | 1 | 1 | nosniff | | X-Frame-Options | 1 | 1 | DENY | | X-Goog-Generation | 1 | 1 | 1774314328054076 | | X-Goog-Hash | 1 | 1 | crc32c=/ExKWA==, md5=ZEg2320r+wMxEfx1FHxfRw== | | X-Goog-Meta-Goog-Reserved-File-Mtime | 1 | 1 | 1774313227 | | X-Goog-Metageneration | 1 | 1 | 1 | | X-Goog-Storage-Class | 1 | 1 | STANDARD | | X-Goog-Stored-Content-Encoding | 1 | 1 | identity | | X-Goog-Stored-Content-Length | 1 | 1 | 153215 | | X-Guploader-Uploadid | 1 | 1 | AMNfjG1SWx8YOj_SoHl51gDd7S4iux_F…N94TZQtgVTWIJCG | | X-Served-By | 1 | 1 | cache-par-lfpg1960043-PAR, cache…essb1270051-BMA | | X-Timer | 1 | 1 | S1774360054.115907,VS0,VE207 | | HTTP header values ------------------ Header | Occurs | Value ------------------------------------------------------------------------------------------------------------------------------------ Accept-Ranges | 1 | bytes Cache-Control | 1 | public, max-age=3600 Content-Security-Policy | 1 | default-src 'self'; script-src 'report-sample' 'self' '…'self'; worker-src 'self'; Content-Type | 1 | text/html Referrer-Policy | 1 | strict-origin-when-cross-origin Server | 1 | Google Frontend Strict-Transport-Security | 1 | max-age=63072000 Vary | 1 | Accept-Encoding Via | 1 | 1.1 google, 1.1 varnish, 1.1 varnish, 1.1 varnish X-Cache | 1 | MISS, HIT, MISS X-Cache-Hits | 1 | 0, 24, 0 X-Cloud-Trace-Context | 1 | e899116c786f6143b99c7e8ff9df19e6 X-Content-Type-Options | 1 | nosniff X-Frame-Options | 1 | DENY X-Goog-Generation | 1 | 1774314328054076 X-Goog-Hash | 1 | crc32c=/ExKWA==, md5=ZEg2320r+wMxEfx1FHxfRw== X-Goog-Meta-Goog-Reserved-File-Mtime | 1 | 1774313227 X-Goog-Metageneration | 1 | 1 X-Goog-Storage-Class | 1 | STANDARD X-Goog-Stored-Content-Encoding | 1 | identity X-Goog-Stored-Content-Length | 1 | 153215 X-Guploader-Uploadid | 1 | AMNfjG1SWx8YOj_SoHl51gDd7S4iux_Ffd5aQeOP7o9qnj_ivTbNESCtkN94TZQtgVTWIJCG X-Served-By | 1 | cache-par-lfpg1960043-PAR, cache-par-lfpg1960028-PAR, cache-bma-essb1270051-BMA X-Timer | 1 | S1774360054.115907,VS0,VE207 HTTP Caching by content type (only from crawlable domains) ---------------------------------------------------------- Content type | Cache type | URLs | AVG lifetime | MIN lifetime | MAX lifetime ---------------------------------------------------------------------------- HTML | Cache-Control + ETag + Last-Modified | 1 | 60 min | 60 min | 60 min HTTP Caching by domain ---------------------- Domain | Cache type | URLs | AVG lifetime | MIN lifetime | MAX lifetime ------------------------------------------------------------------------------------ developer.mozilla.org | Cache-Control + ETag + Last-Modified | 1 | 60 min | 60 min | 60 min HTTP Caching by domain and content type --------------------------------------- Domain | Content type | Cache type | URLs | AVG lifetime | MIN lifetime | MAX lifetime --------------------------------------------------------------------------------------------------- developer.mozilla.org | HTML | Cache-Control + ETag + Last-Modified | 1 | 60 min | 60 min | 60 min Best practices -------------- Analysis name | OK | Notice | Warning | Critical -------------------------------------------------------------------------------- Invalid inline SVGs | 10 | 0 | 0 | 0 Duplicate inline SVGs (> 5 and > 1024 B) | 10 | 0 | 0 | 0 Large inline SVGs (> 5120 B) | 10 | 0 | 0 | 0 Heading structure | 2 | 0 | 0 | 0 DOM depth (> 30) | 1 | 0 | 0 | 0 Non-clickable phone numbers | 1 | 0 | 0 | 0 Title uniqueness (> 10%) | 1 | 0 | 0 | 0 Description uniqueness (> 10%) | 1 | 0 | 0 | 0 Brotli support | 0 | 0 | 1 | 0 WebP support | 0 | 0 | 1 | 0 AVIF support | 0 | 0 | 1 | 0 Accessibility ------------- Analysis name | OK | Notice | Warning | Critical ------------------------------------------------------------------- Missing aria labels | 23 | 0 | 17 | 2 Missing form labels | 0 | 0 | 1 | 0 Missing roles | 0 | 0 | 7 | 0 Missing html lang attribute | 1 | 0 | 0 | 0 Source domains -------------- Domain | Totals | HTML ------------------------------------------------------- developer.mozilla.org | 1/150kB/216ms | 1/150kB/216ms Content types ------------- Content type | URLs | Total size | Total time | Avg time | Status 20x ------------------------------------------------------------------------ HTML | 1 | 150 kB | 216 ms | 216 ms | 1 Content types (MIME types) -------------------------- Content type | URLs | Total size | Total time | Avg time | Status 20x -------------------------------------------------------------------------------------- text/html | 1 | 150 kB | 216 ms | 216 ms | 1 DNS info -------- DNS resolving tree ------------------------------------------------------------------------ developer.mozilla.org mozilla.map.fastly.net IPv4: mozilla.map.fastly.net. IPv4: 199.232.173.91 IPv6: mozilla.map.fastly.net. IPv6: 2a04:4e42:6b::347 DNS server: 127.0.0.53 Security -------- Header | OK | Notice | Warning | Critical | Recommendation ----------------------------------------------------------------------------------------------------------------------------------------- Feature-Policy | 0 | 0 | 1 | 0 | Feature-Policy header is not set. It allows en…ssions-Policy is set. Permissions-Policy | 0 | 0 | 1 | 0 | Permissions-Policy header is not set. It allow…eatures for security. Server | 0 | 1 | 0 | 0 | Server header is set to 'Google Frontend'. It…al used technologies. Strict-Transport-Security | 1 | 0 | 0 | 0 | X-Frame-Options | 1 | 0 | 0 | 0 | X-XSS-Protection | 1 | 0 | 0 | 0 | X-Content-Type-Options | 1 | 0 | 0 | 0 | Referrer-Policy | 1 | 0 | 0 | 0 | Content-Security-Policy | 1 | 0 | 0 | 0 | Analysis stats -------------- Class::method | Exec time | Exec count ------------------------------------------------------------------------------- SslTlsAnalyzer::getTLSandSSLCertificateInfo | 402 ms | 1 BestPracticeAnalyzer::checkNonClickablePhoneNumbers | 3 ms | 1 AccessibilityAnalyzer::checkMissingAriaLabels | 3 ms | 1 BestPracticeAnalyzer::checkHeadingStructure | 3 ms | 1 AccessibilityAnalyzer::checkMissingLabels | 3 ms | 1 BestPracticeAnalyzer::checkMaxDOMDepth | 3 ms | 1 AccessibilityAnalyzer::checkMissingRoles | 2 ms | 1 AccessibilityAnalyzer::checkMissingLang | 2 ms | 1 BestPracticeAnalyzer::checkInlineSvg | 0 ms | 1 AccessibilityAnalyzer::checkImageAltAttributes | 0 ms | 1 SeoAndOpenGraphAnalyzer::analyzeHeadings | 0 ms | 1 SecurityAnalyzer::checkHtmlSecurity | 0 ms | 1 BestPracticeAnalyzer::checkMissingQuotesOnAttributes | 0 ms | 1 SecurityAnalyzer::checkHeaders | 0 ms | 1 SeoAndOpenGraphAnalyzer::analyzeSeo | 0 ms | 1 SeoAndOpenGraphAnalyzer::analyzeOpenGraph | 0 ms | 1 BestPracticeAnalyzer::checkTitleUniqueness | 0 ms | 1 BestPracticeAnalyzer::checkBrotliSupport | 0 ms | 1 BestPracticeAnalyzer::checkMetaDescriptionUniqueness | 0 ms | 1 BestPracticeAnalyzer::checkWebpSupport | 0 ms | 1 BestPracticeAnalyzer::checkAvifSupport | 0 ms | 1 Content processor stats ----------------------- Class::method | Exec time | Exec count ----------------------------------------------------------------------------------- HtmlProcessor::findUrls | 4 ms | 1 CssProcessor::findUrls | 1 ms | 1 NextJsProcessor::applyContentChangesBeforeUrlParsing | 0 ms | 1 JavaScriptProcessor::findUrls | 0 ms | 1 AstroProcessor::findUrls | 0 ms | 1 AstroProcessor::applyContentChangesBeforeUrlParsing | 0 ms | 1 NextJsProcessor::findUrls | 0 ms | 1 JavaScriptProcessor::applyContentChangesBeforeUrlParsing | 0 ms | 1 SvelteProcessor::findUrls | 0 ms | 1 SvelteProcessor::applyContentChangesBeforeUrlParsing | 0 ms | 1 HtmlProcessor::applyContentChangesBeforeUrlParsing | 0 ms | 1 CssProcessor::applyContentChangesBeforeUrlParsing | 0 ms | 1