Maybe this is obvious to you all, but I thought I'd mention that it is possible to resize images in FF. If you enable images in the color control input and bring in your input image that way, you can essentially resize the image to whatever you want by creating a new image with the given dimensions. Placement options give some additional freedom in cropping the image to your liking.
I guess that approximately 100% of people would do this in Photoshop, but just wanted to mention it is possible to do so directly in FF, in case you felt like it some day for some reason, like boycotting Photoshop.