The Hubble website is concerned about your computer.
I was trying to find a good public domain image of the Pleiades, and came across this gem on the “download high resolution” page for this image.
Emphasis mine.  (It’s really kind of sweet.)

These images should be downloaded, not viewed with a  browser. Even though the file sizes may be small, the  number of pixels these images contain can be problematic  for a browser. The image may not appear, it may cause your  Web browser to lock up, or it may crash your computer.  Some Web browsers will display a “broken image” icon in  response to your attempt to view the picture.
If you simply want to look at a picture on the screen, we recommend choosing one of the other  image formats offered, such as those in the category “Screen” or “Print.”
If you still want to use this format, we strongly recommend that you download our “high resolution  images” rather than our “full resolution  images.” The “high resolution images” provide a more manageable  file size for most computers. Very few computers will be able to handle the “full resolution images,”  which are intended mainly for digital and printed material.
To download the image, right-click (control-click on a Mac) on the  following  link, then choosing “Save Target As.” You can then try to  open the file using dedicated image-viewing software.

I feel so … looked out for, you know?
Hilariously, I originally found the (same resolution!) image on Wikimedia, with nary a warning to be seen.

The Hubble website is concerned about your computer.

I was trying to find a good public domain image of the Pleiades, and came across this gem on the “download high resolution” page for this image.

Emphasis mine.  (It’s really kind of sweet.)

These images should be downloaded, not viewed with a browser. Even though the file sizes may be small, the number of pixels these images contain can be problematic for a browser. The image may not appear, it may cause your Web browser to lock up, or it may crash your computer. Some Web browsers will display a “broken image” icon in response to your attempt to view the picture.

If you simply want to look at a picture on the screen, we recommend choosing one of the other image formats offered, such as those in the category “Screen” or “Print.”

If you still want to use this format, we strongly recommend that you download our “high resolution images” rather than our “full resolution images.” The “high resolution images” provide a more manageable file size for most computers. Very few computers will be able to handle the “full resolution images,” which are intended mainly for digital and printed material.

To download the image, right-click (control-click on a Mac) on the following link, then choosing “Save Target As.” You can then try to open the file using dedicated image-viewing software.

I feel so … looked out for, you know?

Hilariously, I originally found the (same resolution!) image on Wikimedia, with nary a warning to be seen.