Here's how to use a second theme in private browsing

    1. Run Vivaldi with --debug-packed-apps --silent-debugger-extension-api.

    2. Right click and inspect part of the browser.

    3. Click on the <body> tag.

    4. Copy everything inside{ } in the sidebar. This should include information about theme colors and corner radius.

    5. Paste that in your custom.css inside .private{ }.

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