Google Keep extension
chrome-signin is not allowed yet as it would start sync all data to Google. But Sync on Vivaldi is not implemented yet.
Too bad it still doesn't work.
I'm already signed in to google/gmail/inbox/keep and keep those pages in my panels - just need only option in right-click menu "Add selection to keep" without copy, open panel, paste and save.
You might want to look at Popup for Keep extension, it has (adds) right-click option.
With all due respect!
Other than the fact that my "closed" post was made 10 months ago instead of the more recent one...
My previous post about Google Keep Chrome Extension
(not to be confused with Google Keep one) and that it should have perhaps been moved to the "incompatible" thread which (if my memory serves me well, did not exist at that time).