Yeah, I'm sure that other plugin is great and all, but once Tim Pope puts his name on something, it becomes an instant default for me.
if, like me, you've thought "wait, but :GBrowse only opens the file", the trick is to _select_ a line first, i.e.
> :{range}GBrowse [args]
Yup this is what I use too. :10,15.Gbrowse will open the current file selected from line 10 to 15
As I discovered yesterday, :Gbrowse also works for other contexts such as jumping directly to the GitHub page for a specific commit after opening one via :Git log or :Git blame.