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Developer tools · #firefox
Explore how Firefox uses Rust and the Stylo engine to parallelize CSS style calculations, reducing main-thread jank on complex web pages.
I'm designing a responsive dashboard layout for Firefox and need to choose between CSS Grid and Flexbox as the primary layout mechanism. Grid gives me true two-dimensional control over rows and columns, which matches the design, but I've read that deeply nested grids can increase paint times on Firefox 110 and later, particularly on lower-end hardware. Flexb
Diagnosing Memory Growth in Firefox The goal is to determine whether a rising memory footprint reported by about:memory and about:processes represents a genuine leak or normal caching behavior. Firefox’s multi‑process architecture isolates sites into separate content processes, so a single content process that grows without bound often signals a site‑level l
Rollout Status and Hardware Constraints Firefox's Fission architecture has been gradually enabled by default since version 86, controlled via the fission.autostart preference. Mozilla's telemetry-driven expansion continues without a published version target for universal enforcement. Memory Overhead vs. Security Baseline Typical memory increases of 10–20% ar
Firefox Profile Recovery The goal is to confirm successful data recovery after a profile backup restoration process in Firefox. The uncertainty lies in verifying the integrity of restored application-specific data across different Firefox versions. Does the standard profile restoration mechanism guarantee the structural validity of internal SQLite databases
An extension intended to run on Firefox and Chromium-based browsers needs consistent request interception across the integration boundary between Firefox WebExtensions and Chromium Manifest V3. Firefox maintains a WebExtensions implementation that aims for Chrome compatibility while retaining Mozilla-specific APIs and historically longer support for Manifest
Goal Determine the exact circumstances under which Firefox, with DNS over HTTPS (DoH) enabled, silently reverts to the system resolver when encountering a certificate validation error during a DoH request. Current Ambiguities Firefox defaults to the system DNS but may override this when DoH is active. A failed TLS handshake on a DoH query can be interpreted
When paginating large bookmark or history datasets through Firefox's Places SQLite API, a mozIStorageResultSet is typically obtained via mozIStorageConnection.executeQuery() and walked page by page with LIMIT and OFFSET. The API does not guarantee stable ordering unless an explicit ORDER BY clause is present, so concurrent writes to the database between page
Firefox's DNS over HTTPS (DoH) feature can inadvertently send internal network queries to public resolvers, potentially exposing private hostnames. To prevent this leak, administrators must decide between relying on the local operating system's DNS configuration or deploying a dedicated internal DoH endpoint. The first approach involves disabling DoH entirel
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sqlite