manifest.json

{
  "manifest_version": 2,
  "name": "tabuse",
  "version": "1.0",
  "description": "organises your tabssssss!.",
  
  "permissions": [
    "tabs",
    "sessions",
    "storage",
    "webRequest",
    "<all_urls>"
  ],

  "background": {
    "page": "bg/bg.html"
  },
  "sidebar_action": {
    "default_title": "tabuse sidebar",
    "default_panel": "ui/index.html"
  },
  "browser_action": {
    "default_title": "tabuse popup",
    "default_popup": "ui/index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "addon@example.com",
      "strict_min_version": "42.0"
    }
  }  
}