: Developers use tools like the CRX Emulator to inspect source code for security or learning purposes.
: If you already have an extension installed, you can use Developer Mode in chrome://extensions to "Pack extension," which creates a CRX file from your local files. How to Extract and View CRX Contents crx extractor/downloader
: Keep a backup of a specific version before an update changes or removes features you like. How to Use a CRX Downloader : Developers use tools like the CRX Emulator