This repository will eventually contain some guides to help you with modding the Vivaldi browser.
Please note that modifications are not officially supported by Vivaldi. There is no guarantee that they will work, they may even break Vivaldi. Vivaldi have no obligation to support modifications or keep the browser backwards-compatible for them.
When a modification stops working, do not blame Vivaldi and instead ask the author of the modification politely if they can fix it. When reporting bugs to Vivaldi, make sure that you have all modifications disabled.