Yes, you modify the .jar file. You would not be able to mod the in-browser version.
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You have to use a crafting table in minecraft you dont need to download it
Where can i download the mod
You can download it of the official minecraft forums.
Download it of the INTERNET and then put it on minecraft
You NEED to have downloaded minecraft to use mods. There are hundreds of mod installation tutorials for all of the most popular mods on YouTube!