Is this something you tried to install, or did this come out of nowhere?

It’s very sad, but many of the software downloaders / installers will trick you into installing not only their program, but other programs as well. You have heard of the fine print in shady contracts, right? Well, some installers you need to look at the itsy bitsy teeny weeny fine print. You are thinking you are giving the installer permission to install the program you want by using the recommended option. But if you use the Manual Option Instead, you discover all kinds of stuff that you do not even know what it is or what it does. From now on, everyone needs to Use The Manual Option to put a stop to this.

Hello,

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You can open the extensions.json file in the Scratchpad and search for this extension. The descriptor field should list its install location.

If the extension currently doesn't appear in extensions.json then try to install the extension temporarily. Check its install location in the extensions.json file.