[wp-trac] [WordPress Trac] #53529: Block based widget admin screen causes a NS_ERROR_FAILURE error in Firefox

[WordPress Trac]

#53529: Block based widget admin screen causes a NS_ERROR_FAILURE error in Firefox
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 Reporter:  walterebert    |       Owner:  (none)
     Type:  defect (bug)   |      Status:  reopened
 Priority:  normal         |   Milestone:  5.8
Component:  Widgets        |     Version:  trunk
 Severity:  normal         |  Resolution:
 Keywords:  needs-testing  |     Focuses:
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Comment (by Clorith):

 Looks like this might be a FireFox bug, relating to the use of iframes,
 which sounds about right for images in a legacy widget, since they would
 trigger an iframe for previewing.

 https://bugzilla.mozilla.org/show_bug.cgi?id=941146

 I wonder if things do not appear broken right now due to the editor and
 the preview of legacy widgets being displayed at the same time, and if you
 click into them, the preview disappears, for images the editor includes a
 preview of the image as well, so you should, in theory, see two identical
 images coming in one after the other if you're just looking at the widget
 list in wp-admin.

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Ticket URL: <https://core.trac.wordpress.org/ticket/53529#comment:10>
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