Compressed Firefox User Profile Data File
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What is a MOZLZ4 file?
A MOZLZ4 file contains Mozilla Firefox user profile data saved in the mozlz4 format. It stores various profile data and settings, which may be information about default search engines, home page configuration, toolbar layout, and saved passwords.
Only the Firefox web browser utilizes MOZLZ4 files so you will most likely only encounter the file(s) if you use Firefox to browse the Internet. The files are primarily stored in the "Profile" folder where Firefox stores information about your web browser user profile. MOZLZ4 files are often found alongside .JSONLZ4 files, which also store user profile data, most often bookmarked websites.
Common MOZLZ4 Filenames
search.json.mozlz4 - The name of a MOZLZ4 file that stores a list of default search engine options for the Firefox web browser.
How to open a MOZLZ4 file
MOZLZ4 files are not meant to be manually opened. Instead, they are referenced by Firefox to load user profile settings. You can delete the files if they become too numerous and large, but you will lose information regarding your user profile.
If you need to modify a MOZLZ4 file, you can open, edit, and save MOZLZ4 files using Firefox with the "mozlz4-edit" add-on installed.