Importing IE bookmarks to Firefox 3.0

Open Internet Explorer.

Go to File > Import and Export > then click Next.
Select Export Favorites, click Next, click Next again (unless you only want to export a subfolder of your Favorites, in which case, select that subfolder now).
Click Export to a File or Address, click Browse to choose a location such as the desktop, USB etc (or accept the default location) and save the file, which is named bookmark.htm by default.
Click Next, then Finish to complete the export.

Now

Open up Firefox
Go to Bookmarks > Organise Bookmarks > Import and Backup > Import HTML…
Click Next
Go to the location you stored the bookmark.htm file then click Open

Congrats you have now imported your IE bookmarks to Firefox