Increase onbeforeunload alerts support

  • Vivaldi (and chrome) support onbeforeunload alerts, such as this:

    However, this alert is only shown when you close a tab.

    Firefox instead shows this alert whenever you navigate away from a page that uses this. Be it:

    • a tab close
    • going to a new URL

    I think that vivaldi should show onbeforeunload alerts in each of these cases:

    • a tab close (V currently does)
    • going to a new URL (firefox does, chrome sometimes does)
    • using the back/forward buttons (neither browser currently does this)

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