Replace images with something generic

Like a grey dummy image with an icon or just a grey solid color. The currently used image is too distracting and doesn't help focussing on the website structure. Thanks :)

Start by locating the JavaScript entry point that replaces images on web pages. Review how the current image is selected, then verify the extension displays a neutral grey placeholder or icon without distracting from page structure. Done means replaced images consistently use the generic treatment.

Written by the indexing model from the issue text.