Document how to test as a Firefox addon w/o signing (#374)

Author: dr-itz

README.md

@@ -38,6 +38,36 @@ Works with [vuex](https://github.com/vuejs/vuex) for time-travel debugging:
 3. `npm run dev`
 4. A plain shell with a test app will be available at `localhost:8080`.
 
+### Testing as Firefox addon
+
+ 1. Install `web-ext`
+
+	~~~~
+	$ npm install --global web-ext
+	~~~~
+
+	Or, for Yarn:
+
+	~~~~
+	$ yarn global add web-ext
+	~~~~
+
+	Also, make sure `PATH` is set up. Something like this in `~/.bash_profile`:
+
+	~~~~
+	$ PATH=$PATH:$(yarn global bin)
+	~~~~
+
+ 2. Build and run in Firefox
+
+	~~~~
+	$ npm run build
+	$ npm run run:firefox
+	~~~~
+
+	When using Yarn, just replace `npm` with `yarn`.
+
+
 ### License
 
 [MIT](http://opensource.org/licenses/MIT)

package.json

@@ -10,6 +10,7 @@
     "lint": "eslint src --ext=js,vue && eslint shells/chrome/src && eslint shells/dev/src && eslint shells/safari/src",
     "build": "cd shells/chrome && cross-env NODE_ENV=production webpack --progress --hide-modules",
     "build:safari": "cd shells/safari && NODE_ENV=production webpack --progress --hide-modules -p",
+    "run:firefox": "web-ext run -s shells/chrome -a dist -i src",
     "zip": "npm run zip:chrome && npm run zip:firefox",
     "zip:chrome": "cd shells && zip -r -FS ../dist/chrome.zip chrome -x *src/* -x *webpack.config.js",
     "zip:firefox": "web-ext build -s shells/chrome -a dist -i src",