Open JSONLZ4 File
The JSONLZ4 file is used to save the description of all the bookmarks used by the Firefox user profile as a compressed backup.
These files are primarily used by Mozilla's Firefox browser, and are similar to JSON files.
Because it is a backup copy, the JSONLZ4 file can be used to recover lost bookmarks when they are deleted, in one way or another, or when a browser version update is downloaded and installed.
The JSONLZ4 files are stored in the "bookmarkbackups" folder, which is inside the Firefox user profile directory.
Because there are multiple JSONLZ4 files in the same folder, the flag is the date it was created.
As mentioned above, the most used software package for working with JSONLZ4 files is: