UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.181 Safari/537.36

Steps to reproduce the problem:
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What is the expected behavior?
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What went wrong?
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Did this work before? N/A 

Chrome version: 66.0.3359.181  Channel: stable
OS Version: 10.0
Flash Version: 

Would be nice if web applications could add items to a tab's context menu. For instance right now each tab's context menu has the same items, New Tab, Pin Tab, Close Tab, etc, on top of that there could be a limited amount of custom menu items. For instance in my case I could have a "Stop Music" option, to stop the audio player in my site, without having to go there first and close it, or making the user close the tab altogether. That's just one example, all kinds of websites could use it in a lot of different ways. For instance in Windows, dock items's context menus often show recent documents, something like that can be implemented. 

It might not be a great idea, so I'm just opening this for discussion and consideration.