Chrome extensions rarely work properly or ruin the security
A few of Chrome extensions are working properly in Vivaldi.
I am using Vivaldi on two Windows 10 laptops. Installing the needed extensions (only a small part of those I have previously installed in Chrome) were making Vivaldi haunted by malware and fraudulent unwanted tabs opening.
Then I started installing the extensions one by one and identified that most of the video download helpers were compromising the security.
Meanwhile, the one that I really needed, Video DownloadHelper, was not working.
Finally, an extension that is especially important for me - X-notifier - is not working properly. After opening one e-mail account the toolbar button does not respond for a long time and I cannot check the next account with unread messages.
I guess that Chrome extensions should not be used directly and they have to be adapted for proper function.
depends on the extension. lastpass used to be a problem, then they fixed it. i have had problems with pocket and evernote apps, but recently they fixed those. in the forum there is a section for extensions and third party applications. i recommend investigating/fixing each extension individually.
If you have any extensions that you'd wish to use in Vivaldi, check if they're already on the list (if so - vote them up) and if they're not - add them to the list. This way we could tell the Vivaldi developers team which extensions we would like to have support for in Vivaldi.