Hello there! Sorry, but OmniFocus doesn’t currently support clickable links in the titles of tasks (or any other item, for that matter). If this is a feature you’d like to see added, we’d love to hear from you – please let us know how it’s important to your workflow!
You could select the link in the task name, ctrl-click on it, and choose ”Open URL” from the popup menu, but that isn’t very convenient. But I found out today that there is a script you could use, if you have the Pro version of Omnifocus, while we’re hoping that The Omni Group will fix this: