Copy the file to your local bin folder and make sure it is executable (you may need to create the bin folder beforehand)
```text
mkdir -p ~/.local/bin
chmod +x ~/.local/bin/set-browser.sh
```
The script requires you to know the desktop file name for the browser in question - run the script without argument to get a list of available browser launchers.
You can find the correct name by searching the folder `/usr/share/applications` as this example shows.
The command searches the file contents for the string __internet__ which indicates a browser applications, pipes the result through cut and print only the last column. Then use the appropriate file as argument for the script.