Disable Little Snitch in guest account?

1. Login to the Guest Account.
2. Disable Little Snitch Network Filter
3. Open Library > Preferences, copy at.obdev.LittleSnitch... to a shared folder
4. Logout and Login to Main Account
5. Open Terminal and run sudo su
6. Open Library/username/Library/Preferences and overwrite file with copied file.
7. Logout and Login to Guest Account. LS is Disabled.

@user43855's steps work correctly (except for step 6 which is missing a crucial bit), but they also assume the user is very familiar with what is being done. I have expanded to include step-by-step details for disabling Little Snitch automatically in the Guest account.

This process creates a Little Snitch preferences file where Little Snitch is disabled, and then copies that file to the User Template folder that is copied every time the Guest account is recreated. (Note the User Template folder is also used for the creation of new accounts, so if you want Little Snitch on in a new account, you will have to enable it after the account is created.)

1. Login to the Guest account.
2. Disable Little Snitch Network Filter in Little Snitch's settings.
3. Open Finder, and press ⌘+Shift+G.
4. In the box labeled "Go to the folder", enter ~/Library/Preferences and press Enter.
5. Find the file named at.obdev.LittleSnitch.plist and right-click on it. Chooose Copy "at.obdev.LittleSnitch.plist".
6. Again press ⌘+Shift+G and this time in "Go to the folder" enter /Users/Shared/.
7. Right-click and choose Paste Item.
8. Log out of the Guest account, and log in to your main account.
9. Open Terminal and type sudo su and press Enter.
10. When prompted, enter your password and press Enter.
11. Type cd "/System/Library/User Template/English.lproj/Library/Preferences" and press Enter.
12. Type cp /Users/Shared/at.obdev.LittleSnitch.plist ./ and press Enter.
13. The next time you log in to the Guest Account, Little Snitch will be disabled.