As for what I want to do, I would like to use it as a menu by reading html prepared in advance on the sub-screen while browsing normally.
If you use pop-up, it will disappear when you operate the main screen, so it will be inconvenient to use.
Is it like a sidebar in Firefox?
Use Firefox sidebar to access bookmarks, history and social features
http://mzl.la/1GSQjHi
Currently, Chrome expansion is not feasible, but requests have been made.It may happen in the near future.
Issue51084-chromium-Add sidebar surface for extensions-An open-source project to help move the web forward.-Google Project Hosting
https://code.google.com/p/chromium/issues/detail?id=51084
This is not a very recommended method, but Content Script allows you to edit the contents of any web page.If you use it, you will be able to forcefully insert something like a sidebar.
For example, there is an extension that detects that Github is displayed and uses Content Script to move the file tree in Github's project to the left.
https://github.com/buunguyen/octotree
"If ""improve UX by setting up a sidebar for a limited web page"" like this, I think some users will be happy."
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