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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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I think it takes up too much screen real estate, and doesn't add anything to the view.
Right- click on menubar, select "customize toolbar", select " titlebar" on left bottom. See here: https://www.reddit.com/r/kde/comments/udvxje/why_are_the_window_decorations_for_firefox/
Right click on tab bar > click on last entry there (forgot how it's called) and finally uncheck second entry from bottom left.
I think there is an option if you right click the toolbar and the go to customize toolbar
https://www.geeksforgeeks.org/techtips/customize-toolbar-firefox/
Well it's not just Firefox, it's all windows.
Idk about Mint in particular. There's a way to do this in most de/wm. I would start in the system settings where you can choose light/dark themes. Then just go top to bottom in the system settings.
Sorry I couldn't help more
Edit: If you don't go through settings systematically like this often, it's good practice. You always find things you'll use later.