Causes the "Redirect Notice" in Google Image Search + How do we know it's working properly? Rated 4 out of 5 stars

It took a while to troubleshoot this, but I discovered this addon is one thing that can cause the infamous "Redirect Notice" that pops up every time you click to view a result from Google Image Search.

I just thought people might be interested to know one possible reason they might be experiencing that.

Also, how exactly do we know the addon is working? Is there some easy way to confirm how the requests are being routed?