Examine source code of redmine_rt

{
  "manifest_version": 2,
  "name": "redmine_rt",
  "version": "1.2resigned1",
  "description": "Connects to redmine_rt plugin using WebSocket for CTI features (issue popup and notifications)",
  "icons": {
    "48": "icons/redmine-48.png"
  },
  "options_ui": {
    "page": "options/options.html"
  },
  "permissions": [
    "webRequest",
    "*://*/",
    "*://*/*",
    "<all_urls>",
    "notifications",
    "storage",
    "tabs",
    "cookies"
  ],
  "browser_action": {
    "default_icon": "icons/redmine-32.png",
    "default_title": "redmine_rt",
    "default_popup": "popup/main.html"
  },
  "background": {
    "page": "background/background.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{30af0003-ee48-4006-96f0-6ab42186bc9f}"
    }
  }
}