Examine source code of PP Interrupter

{
  "manifest_version": 2,
  "name": "PP Interrupter",
  "version": "0.8",

  "description": "Interrupts web-navigation to specified urls in order to Protect Privacy.",

  "icons": {
    "48": "icons/pp-red_48.png"
  },

  "applications": {
    "gecko": {
      "id": "{c35621af-46f1-4338-a8b6-c26bba37fb98}"
    }
  },

  "permissions": [
    "<all_urls>",
    "notifications",
    "storage",
    "webRequest",
    "webRequestBlocking"
  ],

  "background": {
    "scripts": ["consts.js", "background.js"]
  },

  "options_ui": {
    "page": "options.html"
  },

//  "page_action": {
  "browser_action": {
    "browser_style": true,
    "default_icon": "icons/pp-red_32.png",
    "default_title": "PP Interrupter"
  }
}