Alright, interesting point of note for this whole Copy/Paste Firefox situation.
This method works perfectly well on PC. However, on Mac this doesn't work at all. I believe it's because the copy function in their finder windows is somewhat different.
So yeah. this works on PC not so much on Mac. Otherwise all the other suggestions seem to work as well. Keeping it under 1000 pixels, right clicking and copy pasting that way.
Thanks for the help guys.