--- title: This Month in Ladybird | daily.dev description: Ladybird's January update covers 324 merged PRs from 40 contributors as the project shifts focus from spec test scores to making real-world websites usable... canonical: https://daily.dev/posts/this-month-in-ladybird-wcqacmmpg twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: This Month in Ladybird | daily.dev og:description: Ladybird's January update covers 324 merged PRs from 40 contributors as the project shifts focus from spec test scores to making real-world websites usable... og:url: https://daily.dev/posts/this-month-in-ladybird-wcqacmmpg og:image: https://api.daily.dev/og/posts/wcqAcmMPG.png og:image:alt: This Month in Ladybird og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # This Month in Ladybird **[Ladybird Browser](https://daily.dev/sources/ladybird)** · 9 min read · 0 upvotes · 0 comments ## Summary Ladybird's January update covers 324 merged PRs from 40 contributors as the project shifts focus from spec test scores to making real-world websites usable ahead of an alpha release. Key changes include adding Chrome and AppleWebKit tokens to the User-Agent string, which unlocked full functionality on Google Search, Gmail, Instagram, and other sites previously served degraded content. A profiling push cut about a second off Gmail's inbox load time through parser caching, layout optimizations, and JS engine tweaks. Other work includes a new AccumulatedVisualContext painting architecture, HTTP range requests for media streaming, YouTube fullscreen support, a LibIPC security hardening pass, HTTP caching improvements (Cache-Control, Vary, Fetch cache mode), regex engine optimizations with proper lookbehind support, various CSS feature additions, SQLite WAL mode for faster localStorage, and replacing the homegrown XML parser with libxml2. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### Why was Gmail loading with a broken or degraded interface in Ladybird browser? Gmail served a degraded UI because Google detected Ladybird's User-Agent string and responded with a stripped-down interface. Adding Chrome/140.0.0.0 and AppleWebKit/537.36 Safari/537.36 tokens to Ladybird's User-Agent string fixed this, unlocking the full modern Gmail UI along with Google Search, Instagram, and other sites that previously served degraded content or HTTP 403 errors. _Developers debugging user-agent sniffing issues can follow browser compatibility fixes like this on daily.dev._ ### How much did profiling-driven optimizations improve Gmail load time in Ladybird? A series of profiling-driven pull requests cut roughly one second off Gmail's inbox load time. Contributing fixes included caching parser data to eliminate HashMap operations in function instantiation (~400ms saved), layout and style optimizations (~500ms), optimized getComputedStyle to avoid unnecessary layout, JS engine tweaks like scoping eval deoptimization per-identifier, and scoping pseudo-class invalidation to the common ancestor instead of the full document tree. _Track real-world browser performance work like this on daily.dev if you care about page load optimization._ ### Does Ladybird browser support MediaSource Extensions for YouTube playback? No, Ladybird does not yet support MediaSource Extensions, so YouTube falls back to serving 360p H.264 video. Despite the lower resolution fallback, fullscreen playback now works correctly on YouTube, building on the browser's initial fullscreen implementation and new HTTP range request support that lets video start playing before the entire file downloads. _Follow daily.dev for updates on browser media playback capabilities like MSE support._ ## Similar posts on daily.dev - [This Month in Ladybird](https://daily.dev/posts/this-month-in-ladybird-jpocwrcjv) · Hacker News · 36 upvotes · 3 comments --- Tags: [#javascript](https://daily.dev/tags/javascript), [#css](https://daily.dev/tags/css) [View this post on daily.dev](https://daily.dev/posts/this-month-in-ladybird-wcqacmmpg) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"This Month in Ladybird","url":"https://daily.dev/posts/this-month-in-ladybird-wcqacmmpg","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/this-month-in-ladybird-wcqacmmpg"},"datePublished":"2026-08-31T05:54:41.756Z","dateModified":"2026-08-31T05:56:20.819Z","description":"Ladybird's January update covers 324 merged PRs from 40 contributors as the project shifts focus from spec test scores to making real-world websites usable...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/f0d04d597be9efdaf11883698ad30378?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/f0d04d597be9efdaf11883698ad30378?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"Ladybird Browser","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"Ladybird Browser","logo":"https://media.daily.dev/image/upload/s--gBOjamNh--/f_auto,q_auto/v1788155675/logos/ladybird?_a=BAMAMicg0","url":"https://daily.dev/sources/ladybird"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/this-month-in-ladybird-wcqacmmpg","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"javascript,css","timeRequired":"PT9M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Ladybird Browser","item":"https://daily.dev/sources/ladybird"},{"@type":"ListItem","position":3,"name":"This Month in Ladybird"}]} {"@context":"https://schema.org","@type":"FAQPage","@id":"https://daily.dev/posts/this-month-in-ladybird-wcqacmmpg#faq","mainEntity":[{"@type":"Question","name":"Why was Gmail loading with a broken or degraded interface in Ladybird browser?","acceptedAnswer":{"@type":"Answer","text":"Gmail served a degraded UI because Google detected Ladybird's User-Agent string and responded with a stripped-down interface. 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