Examine source code of vimkeybindings

{
  "manifest_version" : 2 ,
  "name" : "vimkeybindings",
  "description" : "Vi(m) directional keybindings for Firefox.",
  "author": "Dietrich Ayala",
  "version" : "2.0.3resigned1",
  "applications": {
    "gecko": {
      "id": "vimkeybindings@autonome.wordpress.com"
    }
  },
  "content_scripts" : [
    {
      "matches" : [
        "<all_urls>" 
      ],
      "js" : [
        "content-script.js" 
      ],
      "run_at" : "document_start" ,
      "match_about_blank" : true 
    }
  ]
}