Link source code lines

I think Ctrl+click does the same in most browsers.

I've been thinking about this issue, too. If it's not too big of a thing, I'd prefer this code to open in a new tab, as is done with the show history button.

I use middle-click to that effect, but having that as default would be good, I think.

As for the links, perhaps simply underlining them (all the time, not only on hover) would suffice.

As in making them different from all the other links? Doesn't the external link icon give them away?

The JS editor does not markup external links differently.

I wonder why not.