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A difference in the electron mass at recombination from the measured valuetoday has been shown to relieve the Hubble tension. In this article we proposea simple mechanism that would allow for such a mass difference. Similar in formto the Higgs field, we consider a Yukawa coupling between the symmetron scalarfield and the electron. However, the symmetron vacuum expectation value dependson the matter density of its environment which, in principle, would allow itscontribution towards the electron mass to differ between recombination andtoday. We detail the coupling and discuss possible observables.

Environment Dependent Electron Mass and the H$_0$-Tension