What is a FBU file?
A .FBU file is a FEBE Firefox Backup File. The FEBE extension creates these files to save user data. This data includes bookmarks, history, passwords, and browser extensions.
How to open FBU files?
You can open .FBU files using the original FEBE extension in older versions of Firefox. Because these files use standard ZIP compression, you can also rename the extension to .ZIP and extract the contents with standard archive tools like 7-Zip or WinRAR.
Inspecting files online
viewer.online/fbu analyzes .FBU files to identify their exact format and creator software, shows which programs can open the file, and usually previews it. If an .FBU file has multiple possible meanings, this tool helps identify the actual format of your specific file.
Summary
Because .FBU files use the known ZIP format, viewer.online/fbu can safely open and display them online, eliminating compatibility problems.