For all your homebrew apps and pkg's I suggest you go here -
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For your MW3 Debug EBOOT -
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Download 4.60/65 Spoofer from nextgen or brewology if you dont already have it of course.
I suggest you download multiman because its a brilliant ftp manager with lots of add on's one being a back up manager so you can install a game straight to your PS3's hard drive. I also recommend you download PSNinja v4 (Wipe history) PSNPatch (Disable custom firmware syscalls) to prevent ban.