You're about to leave the mangler. Everything you've built (chain, selection, and any un-exported layer history) is lost — the browser saves nothing of this session, that's the point.
Tip: before you leave, export with DL .TIFF / .PNG / .JPG if you want to keep any of the layers you made.
OVERDOSE builds a random stack of 5–7 effects with extreme parameters and fires it straight onto the current selection (or the whole buffer, if nothing is selected).
Risks:
Tip: nothing is committed until you hit APPLY, and UNDO (Cmd+Z) takes you back to the previous layer.
RESET wipes everything — the current image, the effects chain, your selection and the entire layer history. None of it can be recovered.
Export first if you want to keep anything: DL .TIFF / .PNG / .JPG. This session is never saved by the browser.