The Instant View Editor uses a three-column layout, so you really want to use it on a desktop screen that's wide enough. Sorry for the inconvenience.

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MDN Web Docs
Adding a panel to the toolbox
How to write an add-on that adds a new tool to the toolbox.

Issue #4

cescus
In my opinion it should be differentiated
Type of issue
IV page is missing essential content
Reported
Feb 10, 2019