manifest.json

{
   "background": {
      "persistent": true,
      "page": "background.html"
   },
   "content_scripts": [ {
      "all_frames": true,
      "js": [ "js/content.js" ],
      "matches": [ "http://*/*", "https://*/*","file://*/*"]
   } ],
   "browser_action": {
      "default_popup": "popup.html"
   },
   "options_page": "options.html",
   "options_ui":{
      "options_page": "options.html",
      "page": "options.html",
      "browser_style": true
   },
   "description": "Convert foregin currency into nepali currency",
   "icons": {
      "128": "img/logo.png"
   },
   "manifest_version": 2,
   "name": "NC",
   "offline_enabled": true,
   "permissions": [ "<all_urls>", "tabs", "webNavigation", "storage"],
   "version": "1.0",
   "web_accessible_resources": [ "img/logo.png", "img/logo-gray.png"],
   "applications": {
      "gecko": {
         "id": "nc@dineshdb.github.io"
      }
   }
}