Disable GNOME (Compiz) task switcher grouping

I hate the grouping windows function. Anti-programmer. I don't want to remember which window should I press Alt+Tab and which window should I press Alt+`.

Just one combo-key: Alt+Tab for all the windows, all the time!!

So here is the solution for Ubuntu GNOME:

1. Open dconf-editor.
2. Go to org/gnome/desktop/wm/keybindings.
3. Move the value 'Tab' from switch-applications to switch-windows.

Done.

Refer to: Mad Physicist's answer to the same question on Super User

The normal behavior doesn't require extra key presses to be able to to switch between the instances. When you get to an application that has multiple instances just keep a while the Alt key pressed (maximum 2 seconds) and you will see that after you can switch between instances also using the same shortcut: Alt+Tab. Just don't take your finger from the Alt key.

Anyway, if you want more, the behavior about you asked can be obtained using CompizConfig Settings Manager (you said that you have it installed). After you open it, first enable Application Switcher:

Second, go inside to Application Switcher, select General tab and play a little with those options until you get what you wish. Personally, I made the following selections:

And the result is:

In my case, I disabled "Application Switcher" and enabled "Shift Switcher" and retained the default options. The windows are not grouped anymore and you get a 'fancy' switcher.

In the screenshot below, the multiple Firefox windows are not grouped together.

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For this to work, you will have to install compiz-config settings manager and its plugins. Run this command on the terminal.

sudo apt install compizconfig-settings-manager compiz-plugins compiz-plugins-extra

Once they are installed, launch compiz config settings manager and go the section 'Window Management'. Thst's where you find both the "Application Switcher" and "Shift Switcher" options.

See screenshot: