Transferring Settings For Mozilla Firefox
1.) On the computer that you are trying to transfer your settings from, navigate to "C:\Documents and Settings\"Windows User Name"
(Note: you will have to enable Show Hidden Files to be able to see this folder. This can be done under Tools->Folder Options-> View->Select "Show Hidden Files and Folders").
2.)The files that hold all your settings for Firefox are the file "profiles.ini" and the folder "Profile" So copy both of these to a thumb drive or another location for now.
3.)Next, on the computer that you are transferring the settings to navigate to the same location
4.) Now, you can either delete or move the folder "Profiles" and the file "profiles.ini" to a different location. To be safe, I usually create another folder within the Firefox folder and store them there just in case something happens, but it's up to you. All that matters is that the older profile file and folder are not in this Firefox folder.
5.) Lastly, simply copy the folder "Profiles" and the file "profiles.ini" that you copied early into this new folder. Once they are there, open up Firefox and all your settings should be there!
Transferring Settings For Thunderbird
This is done exactly like the Firefox settings except that the files are stored in "C:\Documents and Settings\