[Bug 230102]

[Patheticcockroach-b]

Indeed, it works for me too. To anyone wondering: the new setting is browser.sessionstore.warnOnQuit. When set to true, you'll get a warning when closing the browser even when session restore is enabled (browser.warnOnQuit still needs to be true too).
I don't know how recently this was added, but it's funny how it seems to have appeared +/- at the same time as a similar behavior in Vivaldi ^^

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https://bugs.launchpad.net/bugs/230102

Title:
  No warning when closing multiple tabs

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