When we click on Edit to edit a template content (like an infobox) in an article with Firefox, nothing happens and we get this error three times in the console:
Uncaught DOMException: Permission denied to access property "ownerDocument" on cross-origin object load.php:354
With debug=on, we get these three errors:
Uncaught DOMException: Permission denied to access property "ownerDocument" on cross-origin object Element.js:301 getDocument Element.js:301 getDimensions Element.js:462 getSize Window.js:216 getSizeProperties Window.js:236 fitLabel ProcessDialog.js:263 emit jQuery setLabel LabelElement.js:171 getSetupProcess Dialog.js:233 proceed Process.js:62 jQuery 2 Uncaught DOMException: Permission denied to access property "ownerDocument" on cross-origin object Element.js:301 getDocument Element.js:301 getDimensions Element.js:462 getSize Window.js:216 getSizeProperties Window.js:236 fitLabel ProcessDialog.js:263 emit jQuery setLabel LabelElement.js:171 updateTitle ve.ui.MWTemplateDialog.js:319 updateTitle ve.ui.MWTransclusionDialog.js:250 onReplacePart ve.ui.MWTemplateDialog.js:154 onReplacePart ve.ui.MWTransclusionDialog.js:165 emit jQuery process ve.dm.MWTransclusionModel.js:237 fetchRequestAlways ve.dm.MWTransclusionModel.js:365 <anonyme> self-hosted:948 jQuery 3 xhr index.js:273 jQuery 4 Uncaught DOMException: Permission denied to access property "ownerDocument" on cross-origin object Element.js:301 getDocument Element.js:301 getDimensions Element.js:462 getSize Window.js:216 updateWindowSize WindowManager.js:707 updateSize Window.js:454 setSize Window.js:438 setMode ve.ui.MWTransclusionDialog.js:231 getSetupProcess ve.ui.MWTransclusionDialog.js:384 proceed Process.js:62 jQuery 2
It may be linked to T254693.