Vivaldi Cache Files
I stopped using Opera after Ver. 9, because I needed to access the cache files on a regular basis. Newer versions still allowed me to find the files in Cache4, but all the file extensions were removed. How is Vivaldi going to set up its cache? I don't use Chrome, because it is almost impossible to locate and categorize its cache files.
In Opera (prior to 15) you could access cache files from directly in the browser. just type opera:cache in the address bar. They removed extensions on the disk to prevent malware from reading it.
No doubt the current versions of Opera, Chrome and Vivaldi don't have cache from the UI.