I concur, I wished I had pushed harder on blocking this back when Safari blocked them. https://ritter.vg/misc/ff/svg-filters.html was an attempt from back then to enumerate the filters and how they applied cross-origin in different browsers. (Surely needs updating.). We landed some telemetry in Bug 1480695 but it never got followed up on... The [probe is still in the tree](https://searchfox.org/firefox-main/search?q=eUseCounter_custom_FilteredCrossOriginIFrame&path=) but the prove seems to be inactive for some reason? I will ask in #telemetry ...
Bug 2004487 Comment 3 Edit History
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I concur, I wished I had pushed harder on blocking this back when Safari blocked them. https://ritter.vg/misc/ff/svg-filters.html was an attempt from back then to enumerate the filters and how they applied cross-origin in different browsers. (Surely needs updating.). We landed some telemetry in Bug 1480695 but it never got followed up on... The [probe is still in the tree](https://searchfox.org/firefox-main/search?q=eUseCounter_custom_FilteredCrossOriginIFrame&path=) but the probe seems to be inactive for some reason? I will ask in #telemetry ...