Does not work on makerworld.com
It works on tumbnails, but not when you click to open the full sized image. Sorry I can't post an example URL

Does the job, thanks – tested with the PDF reports under https://ec.europa.eu/digital-single-market/en/news/annual-self-assessment-reports-signatories-code-practice-disinformation-2019#block-views-39e10d54fad34071dca96fe7d7133f38

Four stars here.

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Five stars to Display inline https://addons.mozilla.org/addon/display-inline/ for having a longer history and offering a support address.