LanguageMON
Firefox monday bookmark backup
File type: Backup file
Files with mon file extension can be usually found as bookmarks backups from some versions of Firefox web browser. Monday backups have this extension by default.
Found 4 different file type records with the same mon filename suffix.
What is mon file?
File type category:
Backup file
Date updated: June 27, 2025
The mon file extension is used by some versions of Firefox web browser for bookmark backup file.
A backup of BOOKMARK.HTML is called BOOKMARK.HTML.MON, when bookmark saved on Monday.
How to open mon file?
You can recover these bookmark backups only in Firefox web browsers.
How to convert mon file?
Once you recovered the backup, you can export the bookmarks to any exchange format available.
Suggested software to open mon file:
Associated software actions with the mon file
Software apps that backup mon files:
Firefox (Microsoft Windows)
Firefox for Mac (Apple macOS / Mac OS X)
Firefox for Linux (Linux/Unix)
Software apps that recover mon files:
Firefox (Microsoft Windows)
Firefox for Mac (Apple macOS / Mac OS X)
Firefox for Linux (Linux/Unix)
C64 picture image file format
File type category:
Bitmap image file
Date updated: September 15, 2016
The mon file extension is associated with the picture image file format, developed for C64, an 8-bit computer, developed by Commodore company.
The mon file contains picture image (320x200, mono).
How to open mon file?
Use RECOIL to open *.mon files.
Suggested software to open mon file:
Associated software actions with the mon file
Programs for viewing mon files:
RECOIL (Multiplatform)
Software apps that print mon files:
RECOIL (Multiplatform)
Maniacs Of Noise audio
File type category:
Audio and sound file
Date updated: April 10, 2019
The mon file extension is related to Maniacs Of Noise a Dutch company that composes sounds and music for various computer games.
The Music composition since the C64 (1987). The Old version was made by Charles Deenen, the New version by Charles Deenen and Frédéric Hahn (mostly).
How to open mon file?
Use compatible tools to work with *.mon files.
How to convert mon file?
Probably can be converted to other formats.
Suggested software to open mon file:
Associated software actions with the mon file
Apps designed for playing mon files:
Amiga Forever (Microsoft Windows)
Software applications that handle other tasks involving mon files:
Amiga Forever (Microsoft Windows)
Monopoly Deluxe game data
File type category:
Game file
Date updated: November 28, 2018
The mon file extension is associated with the Monopoly Deluxe a computer version of popular desk game called Monopoly.
The mon file stores various data used for internal purposes of the game.
Most likely some old format without support. No further information could be found.
Suggested software to open mon file:
Associated software actions with the mon file
Software applications that handle other tasks involving mon files:
Monopoly Deluxe (Microsoft MS-DOS)