Can't use on local files

[ircrp]

Steps to reproduce:

1. Open file from local file system, e.g. file:///C:/Users/home/Pictures/test.png
2. Right click on the image and bring up Magic Copy
3. Once magic copy is up, notice that clicking on any part of the image does not extract any objects

[kevmo314]

Does this happen when you install the extension locally? I am able to work off of local files. I did see that it breaks for the release version, I think #21 might fix that.