Firefox Developer Edition
Firefox Developer Edition is a desktop web browser built for web development, testing, and everyday browsing on macOS and other major platforms.
What is Firefox Developer Edition?
Firefox Developer Edition is a desktop web browser for people who build and test websites, web apps, and browser-based experiences. It combines everyday browsing with tools that help developers inspect pages, debug code, and evaluate how sites behave across modern web standards. On macOS, users commonly install it as a separate browser for development work so they can keep web projects, logins, and test settings apart from a regular browsing setup. It supports tabbed browsing, extensions, privacy controls, and built-in developer tools for examining HTML, CSS, JavaScript, network activity, and responsive layouts. Firefox Developer Edition is published by Mozilla Corporation and is also available on other desktop platforms, which makes it useful in cross-platform development workflows.
Key features
- Browse websites in a separate browser environment for development and testing
- Inspect and edit page HTML and CSS with built-in developer tools
- Debug JavaScript and monitor network requests while pages load
- Test responsive layouts with device and viewport emulation
- Use extensions and standard browser features alongside development workflows
- Keep development profiles, settings, and sessions separate from a regular browser
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Inspect caches, support files, containers, and login items before cleaning.
Safety overview
Status: Safe
Firefox Developer Edition is legitimate browser software. It stores browsing data such as history, cookies, downloads, saved site settings, and any information you choose to save in the browser. Network access is expected because the app loads websites, checks for updates, syncs data if you enable Mozilla account features, and can install extensions. As with any browser, use trusted extensions, keep it updated, and review sync or privacy settings if you use it for sensitive work.
Recommendation: Keep Firefox Developer Edition if you use it for web development, testing, or as a separate browser profile from your main browser. Remove it only if you no longer need that workflow, and expect to lose its local browser data unless you export or sync what you want to keep first.
Common paths
/Applications/Firefox Developer Edition.app
Cache paths
~/Library/Caches/Firefox~/Library/Caches/Mozilla
Support paths
~/Library/Application Support/Firefox
Preference paths
~/Library/Preferences/org.mozilla.firefoxdeveloperedition.plist
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