Firefox and Chrome are old web browsers being constantly updated and I think it's time they both build new web browsers from the ground up. With Microsoft's Edge web browser being announced, a completely new web browser with full extensions and all the goodies it offers, I think Mozilla and Google will see a drop in numbers for user support.
On a side note, I'd like to see all new web browsers no longer support Java or Adobe Flash Player. With html5 being available, that should take priority over those 2 as Java and Adobe are security risks and outdated software themselves and all websites, including Facebook, need to migrate their video content to html5.
What do you guys think? Should Google and Mozilla build new web browsers or just keep updating what they have? Should html5 reign supreme?