Fabien Cazenave is a seasoned software engineer and entrepreneur with 15+ years building web front-ends, browser extensions and desktop apps, currently running his consultancy Promethee Concept from Grenoble. A longtime FLOSS enthusiast and Vim evangelist, he has deep expertise in JavaScript (frontend & Node.js), HTML/CSS, accessibility, and internationalization—contributions include localization work on Mozilla’s Gaia/Boot to Gecko UI. He’s led Firefox OS development at Mozilla and Phoxygen and has delivered projects for clients like Air Liquide, CEA/LETI and TypeMatrix, blending product-driven engineering with pragmatic consulting. Trained as an engineer in physics, signal processing and industrial protocols, he also brings instrumentation and test-measurement experience from earlier roles. Known for a geeky love of web technologies and an unexpected proficiency at foosball, he combines hands-on coding with a long track record of cross-browser and document-engineering problem solving.
15 years of coding experience
15 years of employment as a software developer
Engineer Physics Mechanics Signal Processing Software Development Industrial Communication Protocols, Engineer Physics Mechanics Signal Processing Software Development Industrial Communication Protocols at ECAM LaSalle
DEPRECATED - Gaia is a HTML5-based Phone UI for the Boot 2 Gecko Project. NOTE: For details of what branches are used for what releases, see
Role in this project:
Front-end Developer
Contributions:1264 commits, 67 PRs, 39 pushes in 3 years 9 months
Contributions summary:Fabien primarily contributed to the UI of the Boot to Gecko (B2G) phone UI project, particularly focusing on the l10n (localization) aspects of the UI. Their work involved fixing bugs related to the l10n.js and pre-localizing HTML files. The user's commits also included improvements to the handling of missing entities, and adjustments to how the application renders its UI.
Vim tweaks for Mozilla contributors and web developers
Contributions:28 commits, 1 PR, 2 pushes in 3 years 6 months
mozillatweaksvim
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