Hey David,
Thanks for your reply.
You are right. For the most part, Chrome extensions do work just fine in Vivaldi. However, since I do sometimes bump into Browser Guard issues, and Malwarebytes Support stated that this is due to the fact that they do not support the Vivaldi browser (yet?). Malwarbytes Support told me that they forwarded my request to look into the possibillity to have Browser Guard also being supported by Malwarebytes; just as they did with multiple other browsers. But don't ask me for a time table, when there would be a Browser Guard update for the Vivaldi browser. 🤷♂️
Cheers,
Robert. 😉