Florian Quèze
Senior Staff Performance Engineer at Mozilla
Toulouse, Occitania, France
Summary
🤩
Rockstar🎓
Top SchoolFlorian Quèze is a Senior Staff Performance Engineer based in Toulouse with 18 years of experience optimizing browser performance and user-facing tooling. At Mozilla he transitioned from front-end tech lead work on Firefox Quantum to managing the Performance Tools team and now focuses on reducing Firefox's power use for a more sustainable web. He combines deep front-end and back-end expertise—contributing to high-profile open-source projects like the Gecko codebase and the Firefox Profiler—improving both UI/UX and low-level performance diagnostics. Known for pragmatic leadership, he blends hands-on code changes (CSS/JS, telemetry, profiler tooling) with strategic engineering management to drive measurable performance improvements. An early instant messaging lead and long-time open-source maintainer, he brings an uncommon mix of product empathy and systems-level optimization.
18 years of coding experience
13 years of employment as a software developer
EPITAEPITA: Ecole d'Ingénieurs en Informatique
Github Skills (14)
css10
javascript10
telemetry10
react10
redux10
devtools10
testing9
profiler9
performance-monitor9
performance-analysis9
performance-optimization8
jestjs7
jtest7
html7
Programming languages (7)
Github contributions (5)
mozilla/gecko-dev
Aug 2012 - Jan 2023
Read-only Git mirror of the Mercurial gecko repositories at https://hg.mozilla.org. How to contribute: https://firefox-source-docs.mozilla.org/contributing/contribution_quickref.html
Role in this project:
Back-end Developer
Back-end DeveloperContributions:1028 commits in 10 years 7 months
Contributions summary:Florian primarily focused on modifying and extending the Mozilla Gecko browser's source code, contributing to the enhancement of about:processes and other components related to core browser functionality. Their work included implementing UI features for better text selection within process descriptions and adding markers in resource use profiles for raptor jobs, indicating a focus on browser performance and debugging. These changes involved modifications to CSS files, JavaScript files, and JavaScript related to the rendering of elements within the browser, suggesting backend and UI integration efforts within the core browser code. Additionally, the user's contributions included removing expired telemetry histograms related to older browser features.
repositoriesfirefoxmercurialgit-mirrormozilla
firefox-devtools/profiler
Feb 2021 - Oct 2022
Firefox Profiler — Web app for Firefox performance analysis
Role in this project:Front-end Developer
Front-end DeveloperContributions:39 reviews, 18 commits, 78 PRs in 1 year 8 months
Contributions summary:Florian primarily contributed to the Firefox Profiler's front-end, implementing new features and improving the user interface. Their work includes adding new category colors, modifying the marker chart display, and enhancing tooltip information. They also addressed issues with profile loading and display, including supporting gzipped data and fixing URL sanitization. These contributions indicate a focus on enhancing the user experience and improving the functionality of the profiling tool.
firefoxreactgecko-profilerperformance-analysisjavascript
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