Firefox .jsonlz4 -> .json Converter
Firefox stores some data in
.jsonlz4 files compressed with LZ4.
The file format has a custom data header - because on introduction no file standard was established yet.
This tool can decompress such
.jsonlz4 files like
sessionstore.jsonlz4 in the profile directory,
upgrade.jsonlz4 in the profile
No data is transferred to the server or third parties. This tool executes entirely client-side in the web browser.