Firefox v0.1.9 docs

Build Identity

Manifest And API Notes

• Manifest V3 build using Firefox background scripts instead of background.service_worker.
• Omits the Chrome-only contentSettings permission.
• Declares browser_specific_settings.gecko.strict_min_version 142.0.
• Declares AMO data collection permissions as none.

Feature Support

• Firefox-compatible background behavior for Add-ons review.
• Local Blob download path for text exports, robots reports, page-copy documents, HTTP trace files, and image ZIP downloads.
• Context-menu support where Firefox exposes the relevant context.
• Same rendered accessibility tree, accessible palette, SERP preview, schema, robots, and export UI as the shared build.

Shared Screens And Abilities

The Firefox build includes the shared Shumway SEO Toolkit v0.1.9 audit model unless a browser-specific limit is listed below.

• Local active-tab SEO auditing with no account, analytics, tracking pixels, remote logging, or background crawling.
• Web Vitals workspace with local Core Web Vitals, CrUX current field data, CrUX history, PageSpeed Insights lab data, refresh controls, and exports.
• Full in-page SEO workspace for Overview, Headings, Links, Images, Schema, Robots, Social, Style, SERP, Webmaster Tools, Tools, Exports, About, and Support.
• HTTP Trace workspace for status codes, response headers, server redirects, final responses, JavaScript redirects, and meta-refresh redirects.
• On-demand link checking for up to 250 URLs per batch with exact status codes, redirect destinations, inline badges, filters, retries, persistent sessions, and exports.
• Rendered page inspection for titles, descriptions, canonicals, headings, links, images, structured data, social metadata, styles, accessibility signals, and source-vs-rendered differences.
• Robots.txt review with grouped multi-crawler testing for core crawlers, detected site-specific crawlers, AI search bots, AI training crawlers, AI user-retrieval bots, and other known crawlers.
• Editable desktop and mobile SERP previews with rich-result-style modules and PNG/WebP preview downloads where downloads are supported.
• Rendered accessibility tree review with landmarks, headings, controls, images, issue chips, multi-select filters, sortable rows, locator copy, JSON export, and expandable previews after the first 100 semantic nodes.
• Documented export and extraction limits: Markdown table truncation, TXT formatting, style sampling, robots.txt/source fetch caps, image ZIP caps, and skipped cross-origin stylesheet behavior.
• Colorblind-friendlier accessible color palette for users who do not want severity communicated by red and green alone.
• CSV, TSV, JSON, Markdown, spreadsheet, image, schema, robots, HTTP trace, page-copy, SERP image, Web Vitals, and accessibility-tree exports where supported by the browser.

Known Browser Limits

• Toggle JavaScript is not available because Firefox does not expose Chromium contentSettings.javascript.
• Firefox must be built from the Firefox target; do not reuse the Chrome ZIP for AMO.
• Some context-menu placements depend on Firefox's supported extension contexts.

Related Pages