TwilightKiddy
If by "regular" you mean Keepass 2.0, then there is a plugin for TOTP.
Thunderbird for desktop, K-9 Mail for Android.
If you want to try a simpler MOBA, try Heroes of the Storm. The game does not get any love from Blizzard anymore, but out of all the MOBA's I know, it has the least minimal knowledge required to play.
MOBA as a genre didn't come from WC3. There were quite a lot of predecessors to DotA, both in WC3 itself and in first StarCraft, namely Aeon of Strife is believed to be the first popular MOBA custom map out there.
Blizzard didn't decide that quirks of WC3 engine are dumb. Yes, they wanted to make a simpler MOBA, but the main reason for lack of funny stuff from WC3 is that they used Galaxy engine for the game, the same one StarCraft 2 was built upon.
And HotS feels less complex not because of Galaxy's vs WC3's quirks (the former has plenty, too), but because of lack of gold and shop, shared experience and an actual tutorial at the beginning of the game.
I don't care about that, you said:
Vivaldi was set as default in Manjaro Linux
And it's not true.
It was set as default for Cinnamon distribution, which is not even maintained by Manjaro developers, it's a community managed distribution.
So, it's default for Cinnamon distribution. That's like saying Amazon AppStore is default for Android just because some manufacturers install it by default. Consider reading the article before quoting it, please.
Excuse me? I switched to Manjaro with Xfce about 3 months ago, and if I wasn't high at the time and remember everything correctly, the default web browser was simply absent. Which is an excellent choice, in my opinion.
No shit, they said "hidden".
Skill issue.