.MOZLZ4 File Extension

Compressed Firefox User Profile Data File

Developer Mozilla
2.5  |  4 Votes

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.

More Information

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.

The mozlz4 format is similar to the .LZ4 archive format but includes a unique file header. It typically stores one or more .JSON files that contain the user profile data in plain text JavaScript Object Notation (JSON) format.

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.

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Programs that open or reference MOZLZ4 files

Verified by FileInfo.com

The FileInfo.com team has independently researched the Compressed Firefox User Profile Data file format and Mac, Windows, and Linux apps listed on this page. Our goal is 100% accuracy and we only publish information about file types that we have verified.

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