How to build
For TESTNET run ./prepare.sh testnet
For MAINNET run ./prepare.sh mainnet
For LIVEREGTEST run ./prepare.sh liveregtest
For REGTEST run ./prepare.sh regtest
To create a Chrome store zip for mainnet, testnet and liveregtest run ./makePackages.sh
Prepares the Chrome extension. Requires npm and Python 2.x with virtualenv, for an example with Debian Stretch see contrib/stretch_deps.sh
Once built, you can just load the directory in Chrome extentions by enabling the developer mode.
Before making a Pull Request for WalletCrx check if what you want to modify is present in https://github.com/greenaddress/GreenAddressWebFiles - if it is then you should do the PR there.