An additional point is, in what form are the URLs.
In the example above, the six URLs are in a list. A text list. Text file.
What, though, if user has Windows desktop links, six little icons, shortcuts?, sitting on desktop. Or in a folder.
In such case, how is the user supposed to get those desktop links into your program?
Probably difficult to code, but ideally the user could simply drag those six desktop links over into your program, and *shazam*, all links suddenly are transformed into a list.
(Wonder how many out there have folder after folder of such links, not even remembering what they would lead to. Wouldn't it be terrific to drag a folder over into your program, generate a big list, and zip through to all sorts of various web pages long forgotten....)
Such a conversion functionality would be pretty significant. Not at all readily found out there.
If the list could then be saved (.txt, or, huge bonus, .html), well, people might be downloading your program simply to have such easy link conversion. Let alone the primary ability to load those links one after the other.