ChatLink allows you to open URLs from within FFXI. Any detected URLs will appear in your chatlog with a number in brackets before them. You can use:
//clink open <number> - to open that URL directly, or
//clink copy <number> - to copy that URL to your clipboard

Note: due to a known issue in windower core, direct opening a URL may crash some people. If this affects you, use the //clink copy command instead.