The title of a web page is shown in the system's title bar and the browser's tab bar. Although Google Chrome only shows the tab bar, Chromium installation in Ubuntu and most other Linux distributions are configured to display both the tab bar and the title bar.
You can configure Chromium to only show the tab bar like Google Chrome to save some screen space and not be redundant. The option to hide Chromium's title bar is available on the browser's Settings page.
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