start vivaldi with this command:
vivaldi-stable --debug-packed-apps --silent-debugger-extension-api
https://forum.vivaldi.net/topic/16684...
https://forum.vivaldi.net/category/52...
https://forum.vivaldi.net/topic/10549...
below are the search engine options i added to vb4c config:
let searchengine vivaldi = ['vivaldi://chrome-urls/', 'vivaldi://%s']
let searchengine github = ['https://github.com', 'https://github.com/search?q=%s']
let searchengine archwiki = ['https://wiki.archlinux.org', 'https://wiki.archlinux.org/index.php?...%s&title=Special%3ASearch&go=Go']
let defaultengine = 'duckduckgo'
let searchalias v = 'vivaldi'
let searchalias gh = 'github'
let searchalias aw = 'archwiki'
let searchalias d = 'duckduckgo'
let searchalias u = 'urbandictionary'
let searchalias g = 'google'
let searchalias w = 'wikipedia'
let searchalias y = 'youtube'
let searchalias i = 'imdb'
let searchalias a = 'woflramalpha'
let completionengines = ['duckduckgo','urbandictionary','google','wikipedia','youtube','imdb','woflramalpha']