The settings icon introduced in I374805e is hardcoded to reside at '/w/extensions/Popups/resources/gear_gray.svg' which can’t be right, it needs to be configuration-dependent. For instance, the code does not even work on the WMF cluster, where it leads to 404, check on the testwiki: https://test.wikipedia.org/w/extensions/Popups/resources/gear_gray.svg
Moreover, I don’t think using SVG files directly like this is acceptable, as older browsers do not support SVG. Cf. https://www.mediawiki.org/wiki/Manual:Assets
Version: unspecified
Severity: normal