One bug 1233927 lands, we don't need any of these shenanigans: https://github.com/mozilla/gecko-dev/blob/master/devtools/client/debugger/debugger-view.js#L524-L526 We can just unconditionally load whatever text is there because the Documents cache speeds it up. We still need to respect `opts` and make sure to set the cursor position in the correct place. But we are explicitly setting the cursor to `0, 0` current anyway, so I think we just need to pull the position from opts instead.

This looks like cleanup to me, so assigning P3 to this.

closing as this is not a priority in debugger.html