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.
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.
You can recover these bookmark backups only in Firefox web browsers.
Once you recovered the backup, you can export the bookmarks to any exchange format available.
Software apps that backup mon files:
Software apps that recover mon files:
File type category:
Bitmap image file
Date updated: October 5, 2026
Record marked as obsolete and not updated for a long time.
The mon file extension identifies a picture format developed for the Commodore 64, an 8-bit home computer made by Commodore.
A mon file contains a 320x200-pixel monochrome image.
The format is obsolete. RECOIL, a multiplatform retro-computer image viewer, can read these files.
Use RECOIL to open a mon file. RECOIL is available for multiple platforms.
Open the mon file in RECOIL and export it to a bitmap format supported by that application. Conversion may not preserve the original C64-specific characteristics.
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).
Use compatible tools to work with *.mon files.
Probably can be converted to other formats.
Apps designed for playing mon files:
Microsoft Windows
Software applications that handle other tasks involving mon files:
Microsoft Windows
File type category:
Game file
Date updated: November 28, 2018
Record marked as obsolete and not updated for a long time.
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.
Software applications that handle other tasks involving mon files:
Microsoft MS-DOS
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