Because this wasn't working natively, there's been an extension to do this job for a while now. https://addons.mozilla.org/en-US/firefox/addon/warn-before-quit/
Said extension is using the legacy extension interface and will no longer work as of Firefox 57. The author claims the APIs necessary to make this extension work in Firefox 57 don't exist (an extension can't tell the browser to quit - which he has to do after intercepting the original Quit command to put up the dialog). https://github.com/nigelbabu/warn-before- quit/issues/16#issuecomment-322359116 It's either time to get this fixed in core, or help the extension author find the right API to finish converting it to a WebExtension. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/583797 Title: "Warn on closing with multiple tabs open" not honored To manage notifications about this bug go to: https://bugs.launchpad.net/firefox/+bug/583797/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
