Examine source code of Hide Fu Comments

{
  "description" : "Hides unwanted/annoying comments from news portals",
  "manifest_version" : 2 ,
  "name" : "Hide Fu Comments",
  "version" : "0.1",
  "homepage_url" : "https://github.com/justasmalinauskas/fu-comments",
  "icons" : {
    "48" : "icons/border-48.png"
  },
  "permissions" : [
    "https://*.delfi.lt/*" ,
    "webRequest" ,
    "webRequestBlocking" ,
    "storage" 
  ],
  "background" : {
    "page": "background.html",
    "persistent" : true 
  },
  "options_ui" : {
    "page": "options/options.html" ,
    "browser_style": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{95949a0d-6b78-4c3a-8462-2ca9e8978c2a}"
    }
  }
}