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Hi ematte,
for starters thanks for your good work!
Im not sure if its already a feature and im missing it,
as i just started using the favorites/thumbnails feature in vivaldi.
Before i used "FVD speeddial" extension, i stopped using it due to security reasons.
If u want to check it out use a seperate like sandbox instance of vivaldi for the test.
(Chrome webstore/FVD speedial (Nimbusweb)
Like this:
Open a new "Create thumbnail" , next open the site of wich the user want a thumbnail
created,, and be able to select/snag - snapshot that site with a selection box.
Wich then creates the thumbnail.
I am aware i can use a snapshot myself and craft an image with it, but it was very easy, like few clicks and done without leavin the session.
If not already present it would be a great addition to your also,- great work, imo.
Be aware (wich you logically are) Thumbnail features overall is in high demand. The FVD speeddial is really popular in/for all browsers.
But as said there are security isseus. (Firefox blocks it, perhaps Vivaldi should look into that, i noted several issues myself)
2 cts, have a great day and thanks for your effort.