Open Google Chrome
Click the three-dot menu in the top-right corner
Select Extensions
Click Visit Chrome Web Store
Search for the extension you want
Open the extension page
Click Add to Chrome
Click Add extension to confirm
Wait for the extension to install
Open the extension from the toolbar or Extensions menu
If needed, pin the extension to the toolbar
If installing from a file, open chrome://extensions
Turn on Developer mode
Click Load unpacked
Select the extension folder