GTA 5 Mods on PS3: What You Need to Know Before You Start
I have seen this question come up on forums at least twice a week for years, usually from someone who just bought a used PS3 and found a website promising free mod downloads. Here is the actual situation, written by someone who has tried everything and learned it the hard way. GTA 5 on PS3 is not moddable in any practical sense. The game was released in 2013, long before Rockstar built any mod support into the console versions. The PS3 operating system locks down the file system, the memory, and the game binaries in ways that make even basic modifications impossible without either a jailbreak or playing through a workaround that nobody actually wants to deal with.
Quick Read How To Install Gta 5 Mods On Ps3 A Simple Guide
Let me be clear about the title you searched for. There is no simple guide. Anything claiming to be one is either outdated, wrong, or about something completely different. The closest thing that exists is running the PC version through an emulator or using custom firmware on a jailbroken PS3, and both of those have serious problems I will explain below. If your PS3 is running custom firmware, you can install .pkg files which include modified game data. The process looks like this. First you need a PS3 that has been jailbroken. Not all PS3 models are jailbreakable. The original fat models from 2006 to 2009 are the easiest. Slim models from 2010 onward are much harder, and the newer super slim models are basically impossible at this point. Check your model number before you do anything else.
Next you install a plugin manager or mod loader. The most commonly used one is rebug toolbox or similar homebrew tools. These sit between the game and the system firmware and intercept file calls, allowing you to redirect the game to load modified textures, scripts, or models instead of the originals. Then you download the actual mod files. Sites like gta5-mods.com do not host PS3 mods because Rockstar does not provide mod support for console versions. The files you find are usually repackaged from PC mods by third parties, which means they are often broken, unstable, or not compatible with your specific game build. I personally ran into a situation where I spent three hours installing a texture overhaul mod on a 3008XX fat PS3 with CFW 4.81, only to have the game crash on the loading screen every single time. The mod was built for version 1.0.335.2 of the game, but my disc was version 1.0.693.0. There is no warning anywhere in the download page about version compatibility, and Rockstar never documented which builds support what.
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The workaround was to downgrade the game using old backup manager tools, which is itself a risky process that can soft brick the console if something goes wrong. I ended up restoring my original firmware and going back to the unmodded version.
Why this does not work for most people
There are several hard limitations that make PS3 GTA 5 modding effectively dead. The first is firmware blocking. Sony has been patching out homebrew support for over a decade. If your PS3 is on firmware 4.90 or later, which most connected consoles are, almost no useful modding tools will run. You would need to stay offline and on old firmware, which means you cannot play multiplayer or update the game. The second is the lack of modding tools. PC modding has decades of community tooling: script hook V, openIV, modloader frameworks, and thousands of creators. PS3 has none of this. Everything has to be built from scratch by people who understand reverse engineering binary files on the Cell processor architecture, which is a very small group of people and a very slow process.
The third is storage. The PS3 hard drive is usually 320GB or 500GB, and GTA 5 already takes up about 50GB. Most mod files are large texture replacements or script additions that simply do not fit without upgrading the drive, and even then the game may not have enough memory to load them properly.

What people actually do instead
Most people who want GTA 5 mods end up buying a cheap secondhand PC or using cloud gaming. The PC version supports Script Hook V, which allows almost any mod you can find online to run. The modding community for GTA 5 on PC is massive, with new content being added daily. Another option some people explore is running the game through RPCS3, the PS3 emulator for PC. This is not easy, requires a powerful computer, and has its own compatibility issues. It also does not give you traditional mod support, though emulators sometimes allow texture packing in ways that consoles do not. If you absolutely must stay on PS3 hardware, the only realistic modification is changing settings within the game itself, like graphics options if your firmware supports the HD update, or adjusting controller vibration and audio settings. That is it.
A note about download sites
Many websites claiming to offer PS3 GTA 5 mods are either scams, hosting malware, or providing files that do not work. I have seen .rar files labeled as mod downloads that contain nothing but adware installers. Always scan files with an antivirus, check the file timestamps, and look for user reports from people with the same PS3 model and firmware version as yours before attempting to install anything. There is no shortcut around the technical reality here. The PS3 was designed to prevent exactly this kind of modification, and after more than ten years of Sony tightening security, the door is mostly closed. The people who still do it are working with very specific hardware configurations and significant patience, and even then success is not guaranteed.