The browser should show line numbers in the left-hand column

[rickmcgeer]

Many editors do this (see VSCode, for example), and it's particularly important when the browser error messages reference line numbers! This has always been an issue with lively, going back (at least!) to the LivelyWeb, and I don't know why this hasn't been done. Even for editors that don't have line numbers (e.g., Sublime) there's a menu with the shortcut for Goto Line indicated (this is a little-appreciated feature of menus; they are a quick guide to keyboard shortcuts)

[merryman]

This was already requested (and planned) in #42 or #152 and summarised in #378. We do not need another ticket for this I guess. Will close this now.