From MozillaZine Knowledge Base

bookmarks.bak is a Firefox backup of bookmarks.html in case of computer failure (ex: power outage). When Firefox is started and bookmarks.html is either missing or reduced to "0", bookmarks.bak will be used, if present, instead of the default set of bookmarks [1].

Editing

This file can be edited in the same manner as bookmarks.html, but there's no reason to do so.

Moving

This file can be moved to a different profile without any extra effort, but there's no reason to do so.

Deleting

Deleting bookmarks.bak will have no effect except for losing a backup. The file will be regenerated, normally the next time Firefox is closed.

Related files and folders

• bookmarkbackups folder
• bookmarks.html
• bookmarks.html.moztmp
• bookmarks-(date).html
• bookmarks-(number).html

Related bug reports

• Bug 218636 - backup bookmark file
• Bug 265120 - Bookmark backup is either broken or useless, bookmarks.bak is always a copy of bookmarks.html

See also

• Bookmarks