Examine source code of LOVE IT

{
  "manifest_version": 2,
  "name": "LOVE IT",
  "description": "Save the things you love from the Web and organise them in your personal collections",
  "version": "1.5.7resigned1",
  "icons": {
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "browser_action": {
    "default_icon": "images/icon.png"
  },
  "background": {
    "scripts": [
      "js/background.js"
    ],
    "persistent": true
  },
  "applications": {
    "gecko": {
      "id": "loveit@lovemylook.uk"
    }
  },
  "permissions": [
    "<all_urls>",
    "tabs",
    "activeTab"
  ]
}