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The issue is not present after wholly disabling uBlock Origin ("uBO") in the browser
I checked the documentation to understand that the issue I report is not a normal behavior
I tried to reproduce the issue when...
uBO is the only extension
uBO with default lists/settings
using a new, unmodified browser profile
Description
It's possible to create background requests using the image-set() CSS function on Firefox. uBlock prevents requests using url() but does not for image-set().
Prerequisites
I tried to reproduce the issue when...
Description
It's possible to create background requests using the image-set() CSS function on Firefox. uBlock prevents requests using url() but does not for image-set().
A specific URL where the issue occurs
https://portswigger-labs.net/
Steps to Reproduce
Expected behavior
image-set() should be blocked like url()
Actual behavior
image-set() is not blocked and a background request is made
uBlock Origin version
1.38.7b19
Browser name and version
Firefox 94.0.1
Operating System and version
MacOS 10.15.7
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