I didn’t know FastForward but it looks great, in fact Skip Redirect didn’t work on many sites.
I’ve been using FastForward for months and every single time it successfully skips redirects. Though the addon is not on Firefox for now due to some miscommunications. You’d have to install it manually here. But if you’re using Chrome or Edge, you can install it directly from the store.
Sandboxie is a sandboxing app. It’s main purpose is to isolate an app from your PC, mainly used to run suspicious apps. It can track what the isolated app does.
It’s rather complicated, so it’s easier to find the game here, or as what I do, use Everything and sort by recently modified files so I can check what files are just written.