To use these add-ons, you'll need to download Firefox.

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This is working fine here with:

* Tampermonkey 4.5.5570
* Firefox 56.0 (64-bit)
* https://greasyfork.org/scripts/404-mouseover-popup-image-viewer/code/Mouseover%20Popup%20Image%20Viewer.user.js

Do you have other add-ons installed? Please disable them and check if Tampermonkey is working as expected. Many WebExtension developers report problems with legacy add-ons.