Since Firecracker is rooted in spaced repetition as a core tenet for building your daily recommended question sets, we don't allow for erasing all of your historical saved performance or progress. Although your history of saved answers will remain stored, you can unmark all topics at once by going to the Study Something Specific page, and using the "Manage Marks" button to unmark topics in bulk. For example, to unmark all Current topics, just hit Manage Marks > Change Current Topics > Change All > Unmark.
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Your most recently saved recall ratings (1-5) will have a greater impact on your next recommended reviews than any older historical questions you've done. So if you haven't done a huge number of total questions in Firecracker, then doing some more questions will effectively give you an updated queue that accurately reflects your newest priorities and most current confidence levels with content.