Download 2Degrees i9300 stock firmware

Open it 
Enter the information as shown in the photo below and then click on "Check Firmware




You can copy them from here:
Model: GT-I9300
Product Code: GT-I9300MBDNZC
Hidswver: I9300XXALE8/I9300NZCALE5/I9300XXLE8/I9300XXALE8

4- Click Download, and it will start downloading the firmware.
5- If the firmware is downloaded in "enc2" format which means it's encrypted, click on "Decrypt Firmware"
6- Enjoy it.
on your phone and it will get you the information you need about your firmware, example here is mine:
Code: NZC
PDA: I9300XXALE8
CSC: I9300NZCALE5
Phone: I9300XXLE8
Product Code: GT-I9300MBDNZC 
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