Black images sometimes invisible with black theme

So, I have black theme for windows and had all sorts of kluges set up to make a black theme on websites in Chrome. After a while, I installed firefox to get around one of the problems it caused, and Firefox detected my settings and was much better from the get go.
One problem remains: sometimes images are invisible. For example, all but the last images on this page: http://what-if.xkcd.com/68/
I think I know what the problem is: 90% of the time, it's a simple white and black image with no boarder. The black stays black, while the background turns black, and the image is transparent. The image loads fine, but it's invisible.
A good way to fix it, 90% of the time, would be to make an addon that finds images, and before letting firefox display them, check if they are transparent and, if they are, check if they only use black. In that case, the image inverts them. This just seems like the most asthetically pleasing solution to me, of course: filling in the transparent areas with white would also work.
So, is there such an addon? It sounds easy to make. Would it work?
This is kind of a pain in the ass on certain cites that use images like this as link buttons.

Hello,
Assuming you are not getting any errors during the acquisition in MAX and didn't change any of the attributes of the camera (running in the default mode), it sounds like the iris on your lens might be closed all the way that it's not letting any light in. Try adjusting the iris so there will be more light going to your sensor. If that doesn't work, try removing the lens from your camera in order to verify that your lens is not the problem. If all these don't make a difference on the acqired image, try a different camera or a different framegrabber that you know is configured properly and works.
I hope this helps!
Regards,
Yusuf C.
Applications Engineering
National Instruments

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