Can you be more precise? Vivaldi sync requires you to login with your vivaldi.net account details, but you also likely set a password on the sync profile itself. The Vivaldi login can be reset, but that sync password is known only by you. That's by design, because Vivaldi respects your privacy. Source: almost 2 years ago

Vivaldi (the company that makes the browser with the same name) runs the community portal https://vivaldi.net/ with a blogging platform, user forum, and webmail service. All this is free of charge and ad free in an attempt to get users interested in also using the Vivaldi browser. Signing up for webmail used to require providing a phone number for sending an SMS verification code to keep spammers away from using... Source: almost 2 years ago

The email client is unique to Vivaldi as far as I know. But I've not had the issues with disappearing messages and I use it with a Gmail, AOL, and vivaldi.net account, not to mention having about 200 RSS feeds as well. Might be something dorked up in your profile? Source: about 2 years ago

Go to vivaldi.net and see if you can find any help in community pages. Source: over 2 years ago

Many people will say Firefox. Firefox is alright. I like Vivaldi: https://vivaldi.net. Source: over 2 years ago

You can run the code provided on https://phpsandbox.io/ to confirm that the server secret and the server seed give you this hash. Source: almost 2 years ago

PHPSandbox — Online developement environment for PHP. - Source: dev.to / over 2 years ago

PHPSandbox is an ”Online development environment for PHP. Where you can quickly prototype or share PHP Projects, without setting up a local environment.”. - Source: dev.to / about 3 years ago

Demo The demo application was implemented in the PHP Sandbox, you can find the application here. - Source: dev.to / about 3 years ago