  We present an investigation of clustered stellar feedback in the form of
superbubbles identified within eleven galaxies from the FIRE-2 (Feedback in
Realistic Environments) cosmological zoom-in simulation suite, at both cosmic
noon (1 < z < 3) and in the local Universe. We study the spatially-resolved
multiphase outflows that these supernovae drive, comparing our findings with
recent theory and observations. These simulations consist of five LMC-mass
galaxies and six Milky Way-mass progenitors (with a minimum baryonic particle
mass of $m_{b.min} = 7100 M_{\odot}$), for which we calculate the local mass
and energy loading factors on 750~pc scales from the identified outflows. We
also characterize the multiphase morphology and properties of the identified
superbubbles, including the `shell' of cool ($T<10^5$ K) gas and break out of
energetic hot ($T>10^5$ K) gas when the shell bursts. For all galaxies, the
outflow mass, momentum, and energy fluxes appear to reach their peak during the
identified superbubbles, and we investigate the effects on the interstellar
medium (ISM), circumgalactic medium (CGM), and subsequent star formation rates.
We find that these simulations, regardless of redshift, have mass-loading
factors and momentum fluxes in the cool gas that largely agree with recent
observations. Lastly, we also investigate how methodological choices in
measuring outflows can affect loading factors for galactic winds.
