Changes the alt text to hover text on SE sites
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When you add an image using Markdown, you are allowed to enter a description:
On Stack Exchange sites, this description is reserved for use as alt text for screenwriters and other accessibility tools, but I've found that the descriptions put there are often quite useful for understanding what the image is about. To read them, you have to edit a post and find the image in the source...until now!
This little script uses the Markdown image descriptions for the hover text of the image so that it's easier to understand why the image is there (and people sometimes like to hide humorous sayings in there).