: To speed up page loads for sites like Amazon and Instagram (reported by Mozilla to be 40–80% faster), Firefox 67 began deprioritizing non-essential features and delaying setTimeout until after the page starts up.
: 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
: Added support for importing JavaScript modules dynamically. 4. Privacy & Security Understanding in depth the profile per installation feature : To speed up page loads for sites
: Provides higher fidelity for pausing execution at specific locations within a single line of code. Developer Tool Updates : Added support for importing
: 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.