Have you ever played with building blocks and tried to put two different pieces together but they just didn't fit? That's kind of like an extension conflict.
When you use a computer, there are different programs and tools you can add on to make it work better for you. These are called extensions. But sometimes, two or more extensions don't work well together. They might try to do the same thing in different ways or use up too much of the computer's resources.
It's like if you had two friends who both wanted to play with the same toy at the same time, but they couldn't figure out how to share it. They might start arguing and the toy would get broken, just like how your computer might stop working properly.
So when you use extensions on your computer, it's important to make sure they work well together and don't cause any conflicts. Otherwise, you might have to remove one of them to make your computer work smoothly again.