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

Issue #1
Missing text
- Sean Wei
- This is not essential
Please refer to this issue:
https://instantview.telegram.org/contest/developer.mozilla.org/template35/issue4/
- Declined by admin
- Text is present
- Type of issue
- IV page is missing essential content
- Reported
- Feb 5, 2019