This is very lazy, but comes in handy for example if your browsing a Windows mount with random uppercases in file/folder names.
Add:
make your tab completion case insensitive
To your $HOME/.inputrc file (create the file if it doesn’t exist). Alternatively you can make this userwide by adding it to /etc/inputrc .
You might need to reset the terminal, but now you can enjoy case insensitive tabbed browsing.