Examine source code of Taskwarrior-Connector

{
  "manifest_version": 2,
  "name": "TaskWarrior Connector",
  "version": "0.2",
  "description": "Save webpage links to taskwarrior",
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "Taskwarrior",
    "default_popup": "popup.html",
    "browser_style": true
  },
  "permissions": [
    "activeTab",
    "tabs",
    "<all_urls>"
  ]
}