Recent snapshots of Vivaldi don't recognize the Flash Player plugin on Linux. [SOLVED on 18.104.22.168]
Before, Vivaldi has found the Flash Player plugin at Google Chrome installation on Linux Mint. Now, after some 2 or 3 newer snapshots, Vivaldi simply doesn't recognize Flash Player plugin anymore... Why?
What snapshot are you using? It's fixed in 22.214.171.124
Some minutes after posting this topic, a new snapshot of Vivaldi appeared in my software updates. I realized just now that this new version (126.96.36.199) fixed that issue.
However, video framerate of recent Flash Player is crap; the older flash plugin used on Firefox works alright. I don't understand it at all… This must be due that old problem of Flash x Linux.