Firefox Developer Edition is the blazing fast browser that offers cutting edge developer tools and latest features like CSS Grid support and framework debugging

Experience cutting-edge browser features in pre-release versions: Firefox Developer Edition, Firefox Beta and Firefox Nightly. Download now!

2021年9月14日 · This article applies to Firefox Developer Edition. See Get community support for help with other Firefox browsers. Firefox Developer Edition integrates all the developer tools you'll need into one package.

2024年12月10日 · Learn how to create add-ons for Firefox, how to develop and build Firefox itself, and how the internals of Firefox and its subprojects work. Our developer guide explains how to get Firefox source code, how to build it on Linux, macOS and Windows, how to find your way around, and how to contribute to the project.

2025年1月28日 · Firefox now includes safeguards to prevent sites from abusing the history API by generating excessive history entries, which can make navigating with the back and forward buttons difficult by cluttering the history. ... With the release of Firefox 135, we are pleased to welcome the developers who contributed their first code change to Firefox ...

2024年8月6日 · Firefox Developer Edition is a distinct iteration of the renowned Mozilla Firefox web browser, carefully crafted and re-modeled to appeal to the unique needs and necessities of web developers and web designers.

Firefox Developer Tools is a set of web developer tools built into Firefox. You can use them to examine, edit, and debug HTML, CSS, and JavaScript. This section contains detailed guides to all of the tools as well as information on how to debug Firefox for Android, how to extend DevTools, and how to debug the browser as a whole.

6 天之前 · This article provides information about the changes in Firefox 135 that affect developers. Firefox 135 is the current Beta version of Firefox and ships on February 4, 2025. These features are newly shipped in Firefox 135 but are disabled by default.

2024年8月9日 · Developer tools are built-in tools provided by the browser that help users and developers analyze the resources used, content, and styles, understand the behavior of web applications, inspect the web page, identify the network …

2024年12月13日 · In Firefox 134: new BiDi command for browser windows, additional fields for network events and better addons support in Marionette. In Firefox 132: retrying commands for improved reliability and bug fixes for our WebDriver BiDi implementation…