Vivaldi browser is part open-source, part closed-source
As most people know, we use Chromium as a foundation for our browser. ... On Android, the UI is implemented in Java and is mostly derived from the Java UI included in Chromium (the license of the Chromium Java code doesn't require us to publish changes made there).
Which browsers still support Java?
So, today Internet Explorer is the only browser that supports Java Applet.
Is Firefox better than Vivaldi?
Simple. With a few quick tweaks, Vivaldi is as efficient and solid a browser as Firefox. Outside of being open source, there is nothing Firefox can do that Vivaldi cannot mimic. Truth be told, if we're looking at a feature-for-feature comparison, Vivaldi easily comes out on top.
