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Re:End-to-End Encryption Plugin for Yahoo Mail by nacs on Sunday March 15, 2015 @07:30PM (#9208715)
They have a Wiki that has build/install instructions: https://github.com/google/end-to-end/wiki/Build-instructions.

Basically, clone the Git repo then do:

  ./do.sh install_deps
  ./do.sh build_extension
This results in an extension folder that can be installed via Chrome's developer mode.

Disclaimer: not affiliated in any way and never used it myself

Re:End-to-End Encryption Plugin for Yahoo Mail by Fastidious on Monday March 16, 2015 @11:55AM (#9212164)
That is the way I built it. I wanted to add that java is required.