This post by Jesse Hollington includes AppleScript to open a URL within a Task’s notes. As far as I could tell, it only opens the first URL it finds.
I am not a great “scripter”, but I wanted it to open all URLs found in a Task’s notes; but hold on because I am even harder to please! I wanted any OmniFocus URLs to open in new tabs (depends on your System Preferences > Dock settings).
If this is duplicated or better elsewhere, let me know and I can apologize (I did do a search).
Due to my lack of AppleScript knowledge, it was a frustrating few hours trying to modify this. I hope it helps someone else out.