Change the opacity of windows by compiz-style shortcut Alt+scroll. You can customize hotkey in Preference page if Alt key doesn't work. Use following modifer key code list to calculate hotkey code(E.g. Ctrl+Alt is 4 + 8 = 12): Shift 1 AltGr 2 Control 4 Alt 8 ShiftL 16 ShiftR 32 CtrlL 64 CtrlR 128 CapsShift 256 https://man7.org/linux/man-pages/man5/keymaps.5.html

Extension Homepage

https://github.com/pbxqdown/gnome-shell-extension-transparent-window

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Shell version… Extension version…