SQL Developer extensions help

Hey folks!
So I've been wanting to delve deeper into building user extensions. Have done several google searches and thus far, I've seen only examples of building an extension into the editor tabs on a table object, or creating a context menu. There are other items I'm curious about which I can't find much information on.
1. Wondering what the 'navigation' user extension does and how to build one?
2. Also, is there a way to build new buttons along the top under the file menu that will run a specific query upon pushing it or something?
Anyone have any useful links I can read up on? I'm just having a problem finding anything relating to what these two questions. Thanks in advance!

Please do not duplicate threads. No answer means nobody can or wants to help.
At most you can bump the first thread in case someone missed it.
Thanks,
K.

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    933874 wrote:
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