What is a JSONLZ4 File Type?
You will probably only encounter JSONLZ4 files if you use Firefox to surf the Internet and browse the directory where Firefox stores information about your profile user. Your user information is stored in a separate location from the Firefox application to prevent your user profile from being lost in case you need to uninstall and reinstall Firefox on your computer.
You can browse to the location of your profile in the list; information by selecting Help → Troubleshooting Information in Firefox. Then click on View in the file Finder; Application Basics "section to open a window that displays your profile folder.
JSONLZ4 is not meant to be opened manually. Instead they are referenced by Firefox to load the user profile settings. You can delete the files; they become too numerous and too large, but you will lose information concerning your profile.
The JSONLZ4 bookmark storage files are created by Firefox to save the' bookmark information that can be restored in the web browser to recover bookmarks lost due to d' an update of the browser version. You can find the JSONLZ4 files in the " bookmarkbackups &" directory, which is located in the Firefox user profile directory. The name indicates the date the file was created.
You can open, edit, and save JSONLZ4 files using Firefox with mozlz4-edit "add-on installed. Firefox Bookmark Backup Reader / Decompressor can also open and convert JSONLZ4 files online.