NEW311728
Page CSP blocks content script background image rendering in action popups 
https://bugs.webkit.org/show_bug.cgi?id=311728
Summary Page CSP blocks content script background image rendering in action popups
Carlos J.
Reported 2026-04-08 06:41:10 PDT
Given the following: Extension opens extension popup The popup has an iframe The iframe is set to a document which declares a CSP with default-src The extension applied a css content script to that document with a data:image based background-image Somehow Webkit does not render this image properly. While other engines render it completely fine. It seems somehow Webkit interprets the CSP as if it should block the css image. See demo extension: http://jeurissen.co/webext-demos/action-popup-content-script-css-data-image
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Radar WebKit Bug Importer
Comment 1 2026-04-08 06:41:16 PDT
<rdar://problem/174316860>
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