Firefox Developer Edition 67 Apr 2026

: Provides higher fidelity for pausing execution at specific locations within a single line of code.

: If system memory drops below 400MB, the browser automatically suspends idle tabs to free up resources, reloading them only when clicked. 3. Developer Tool Updates Firefox Developer Edition 67

: Version 67 shifted to a "profile per installation" architecture. This allows different Firefox versions (e.g., Developer Edition, Beta, and Nightly) to run simultaneously on the same machine without sharing—and potentially corrupting—profile data. : Provides higher fidelity for pausing execution at

: Developers can now track all CSS modifications made within the browser and copy either the full set of changes or individual rules directly. JavaScript Debugger Improvements : Developer Tool Updates : Version 67 shifted to

: The system for selecting the dedicated default profile was standardized to match other versions of Firefox, moving away from specific profile naming like "dev-edition-default". 2. Performance Enhancements

: Added support for importing JavaScript modules dynamically. 4. Privacy & Security Understanding in depth the profile per installation feature

: A new panel for streamlined debugging of web workers.