Whilst I recommend that you use the plugins that are on the add-on stores of the respective browsers, building the apps yourself is perfectly possible. I build the apps on ubuntu, so have made sure that the build scripts work for me, use on other platforms may vary.
As you can tell, the quality of the code isnt perfect, or to a particular standard. Once the plugin works properly to a basic level, I will install some linting software to make the code look nicer, and possibly run smoother too.