Ensure your node version matches .nvmrc
Install node modules:
$ npm i
Start build+watcher:
$ npm run start
Launch Firefox with the extension pre-installed using web-ext.
$ npm run firefox
This should open up Firefox with the extension installed for testing. The utility reloads the extension whenever files change in build/ folder.
Ensure your node version matches .nvmrc
Install node modules:
$ npm i
Run npm run firefox-release to generate an archive in the local tmp directory.