I'd like to hide the tab bar when there's only one tab opening. Because I open 4 windows so 4 tab bar actually takes quite a lot screen real estate.
I use Google Chrome the Linux version.
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This will open a new window with your current page without tabs and close the current page.
I am not entirely certain that this will work on the Linux version of Google Chrome, but I know for the version on Windows, this might solve your problem...
If I am understanding you correctly, you would like to essentially get rid of the tabs on Google Chrome and since you seem to be concerned about screen real estate, it makes me think that making Google Chrome full screen will help. F11 will make it full screen (again, this is how you at least do this in Windows)
If I am misinterpretting your question, please correct me so I can try to give you the correct answer.