INSTALLER COMMAND LINE OPTIONS
--vivaldi-install-dir 
--vivaldi-silent
--vivaldi-standalone
--vivaldi-register-standalone
--disable-vivaldi

INSPECT UI
https://forum.vivaldi.net/topic/16684/inspecting-the-vivaldi-ui-with-devtools

vivaldi.exe --debug-packed-apps --silent-debugger-extension-api
vivaldi://inspect/#apps/

--remote-debugging-port=9222
http://localhost:9222/

SSL CAPTURE
vivaldi.exe --ssl-key-log-file="%appdata%\wireshark\ssl-keys.log

DEBUG LOGS
vivaldi --enable-logging
Verbose: --v=3
vivaldi --enable-logging=stderr --v=3 > log.txt 2>&1
https://www.chromium.org/for-testers/enable-logging/

DELETE BOOKMARK THUMBS
jq 'del(recurse | objects | select(has("Thumbnail")) .Thumbnail | select(startswith("data:image")))' Bookmarks > Bookmarks.new
Dangerous, deletes all thumbs:
jq 'del(recurse | objects | .Thumbnail)' Bookmarks > Bookmarks.new

EXPORT HOTKEYS
jq '.vivaldi.actions' Preferences > actions.json

IMPORT HOTKEYS
jq '.vivaldi.actions = input' Preferences actions.json > Preferences.new

COUNT BOOKMARKS
grep -c 'url":' Bookmarks
grep -c 'Thumbnail":' Bookmarks

DOWNLOAD CHANGELOGS
wget -mH -nd -e robots=off -A .html -I "/update" "https://vivaldi.com/download/archive/?platform=win"
wget -mH -nd -e robots=off -A .txt --user "sopranos" --password "xxx" "https://sopranos.vivaldi.com/oldsopranosmails.html"

LIST HISTORY URLS
sqlite3 -csv -header History "SELECT urls.url as 'URL', urls.title as 'Title', urls.visit_count as 'Visit Count', datetime(visits.visit_time / 1000000 + (strftime('%s', '1601-01-01')), 'unixepoch', 'localtime')  as 'Date' \
FROM urls, visits \
WHERE urls.id = visits.url;" > history.csv

BACKUP SEARCH ENGINES
sqlite3 -markdown "Web Data" "select short_name, keyword, url, suggest_url, image_url, search_url_post_params, suggest_url_post_params, image_url_post_params from keywords;" > keywords.md
sqlite3 -json "Web Data" "select short_name, keyword, url, suggest_url, image_url, search_url_post_params, suggest_url_post_params, image_url_post_params from keywords;" > keywords.json
sqlite3 "Web Data" ".dump keywords" > keywords.sql

TRANSLATION TEST
curl -H 'Content-Type: application/json' -d '{"source":"en","target":"zh-Hans","q":["Customizations & Extensions"]}' "https://mimir.vivaldi.com/translate"