Copying Firefox Bookmarks

When I copied my bookmarks to another location, I opened it to check the accuracy, only to find out that it is not the same as what is in the browser window. I go to the location:
C:\Documents and Settings\Robert\Application Data\Mozilla\Firefox\Profiles\7mdla009.default
This is something that must have happened recently, or I have just noticed the difference. Any thoughts on this ?
Thanks,
Rob

 

Thank you for your help in this matter. I thought that it automatically updated when I closed the program.
Rob

 

The backup is not part of Firefox, and, as such it can't update. A backup is to be used in cases of localized disasters, or to be used with another program. I have three versions of Firefox, and, basically, the same bookmarks, except that since they are independent, they deviate more and more, over time.
I am using Firefox3.5.3 Portable, from a thumb drive. It was set up long time ago, and it has a slightly different bookmark array than my 3.5.3 on the hard drive, or, even the same Portable found in the hard drive.

 

http://kb.mozillazine.org/Export_bookmarks
"You can set Firefox 3 to automatically export your bookmarks at exit to the Firefox profile folder "bookmarks.html" file by setting browser.bookmarks.autoExportHTML to true but this may delay browser shutdown if you have a large number of bookmarks. "
type about:config in the location bar, filter for browser.bookmarks.autoExportHTML
set to true