Hi Susobh,
Thank you for the help.
I made some changes, like extending the chrome bar widget and removing the hidden header bar, which event listeners had been replaced by the same listeners in the container javascript code.
The result is good, so I can proudly attach a screenshot to show it to you.
One thing that I wasn't able to handle is the badge counter when there is specified an application icon from the fgl program, which overrides the hamburger menu icon, therefore in the extension of the chrome bar widget I added a few lines for hiding the custom icon and keep the stock gbc icon.
Bye!