NOTE: You can delete JSONLZ4 files if they become too numerous and large, but you will lose information regarding your user profile. For example, a JSONLZ4 created on Januwill be named similar to the bookmarks-_17_1T-HiRwoo9NtkjBaXWII-A=.jsonlz4 filename. The name of the file indicates the day it was created. You can find JSONLZ4 files in the bookmarkbackups folder, which is located in the Firefox user profile directory. Bookmarks may be lost for various reasons, such as a system crash or browser version update. JSONLZ4 files that store bookmarks are created by Firefox to back up bookmark information that can be restored in the web browser to recover bookmarks. Users//Library/Application Support/Firefox/Profiles/ Where are JSONLZ4 files that contain backup bookmarks stored? The directory is most likely the following path: Then, click the Show in Finder button next to "Profile Folder" in the "Application Basics" section to open a window that displays your profile folder.
In macOS - You can navigate to the location of your profile information by selecting Help → Troubleshooting Information in Firefox. The directory is most likely the following path:Ĭ:\Users\\AppData\Roaming\Mozilla\Firefox\Profiles\ Then, click the Open Folder button next to "Profile Folder" in the "Application Basics" section to open a window that displays your profile folder. In Windows - You can navigate to the location of your profile information by clicking the Menu icon (appears as three horizontal lines) and selecting Help → Troubleshooting Information in Firefox. I knew it was a matter of time before session restore would break but I needed the memory efficiency of newer FF versions. Firefox's Profiles directory is stored in different locations on different operating systems. I used to use the session manager add on to save my sessions until FF 57 broke legacy add ons. JSONLZ4 files are stored in subdirectories of Firefox's Profiles directory, including the bookmarkbackups and datareporting/archived directories. The reason your user information is saved in a separate place from the Firefox application is to protect your user profile from being deleted if you need to uninstall and reinstall Firefox on your computer.
You will most likely encounter JSONLZ4 files only if you use Firefox to browse the Internet and are exploring the Profile folder where Firefox stores information about your user profile.