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Reionization is thought to be driven by faint star-forming galaxies, butcharacterizing this population in detail has long remained very challenging.Here we utilize deep nine-band NIRCam imaging from JADES to study thestar-forming and ionizing properties of 756 $z\sim6-9$ galaxies, includinghundreds of very UV-faint objects ($M_\mathrm{UV}>-18$). The faintest($m\sim30$) galaxies in our sample typically have stellar masses of$M_\ast\sim(1-3)\times10^7$ $M_\odot$ and young light-weighted ages ($\sim$50Myr), though some show strong Balmer breaks implying much older ages ($\sim$500Myr). We find no evidence for extremely massive galaxies ($>3\times10^{10}$$M_\odot$) in our sample. We infer a strong (factor $>$2) decline in thetypical [OIII]$+$H$\beta$ EWs towards very faint $z\sim6-9$ galaxies, yet aweak UV luminosity dependence on the H$\alpha$ EWs at $z\sim6$. We demonstratethat these EW trends can be explained if fainter galaxies have systematicallylower metallicities as well as more recently-declining star formation historiesrelative to the most UV-luminous galaxies in our sample. Our data provideevidence that the brightest galaxies are frequently experiencing a recentstrong upturn in SFR. We also discuss how the EW trends may be influenced by astrong correlation between $M_\mathrm{UV}$ and Lyman continuum escape fraction.This alternative explanation has dramatically different implications for thecontribution of galaxies along the luminosity function to cosmic reionization,highlighting the need for deep spectroscopic follow-up. Finally, we quantifythe photometric overdensities around two $z>7$ strong Ly$\alpha$ emitters inthe JADES footprint. One Ly$\alpha$ emitter lies close to a strong photometricoverdensity while the other shows no significant nearby overdensity, perhapsimplying that not all strong $z>7$ Ly$\alpha$ emitters reside in large ionizedbubbles.

The Star-forming and Ionizing Properties of Dwarf z~6-9 Galaxies in JADES: Insights on Bursty Star Formation and Ionized Bubble Growth