Feature Request: Transparency Grid

[BoffinBrain]

As a web designer, it's very useful to be able to toggle the color of the background when looking at an image with transparency. I have a personal stylsheet I use for this purpose, which sets the background behind the image to a white/gray checkerboard when hovering over it. I would suggest adding a similar feature to your addon.

[marsjaninzmarsa]

Pull requests are welcome, I believe. 😉