Examine source code of Pin Tabs

{
  "applications": {
    "gecko": {
      "id": "pintabs@pintabs.com",
      "strict_min_version": "57.0"
    }
  },
  "author": "Thomas Spencer",
  "background": {
    "scripts": [
      "pintabs-background.js"
    ]
  },
  "browser_action": {
    "default_icon": "ic_tab_black_48px.svg",
    "default_title": "Pin Tabs"
  },
  "description": "Pins homepage URLs as tabs",
  "developer": {
    "name": "Thomas Spencer"
  },
  "homepage_url": "https://bitbucket.org/ntists02/pintabs",
  "icons": {
    "48": "ic_tab_black_48px.svg"
  },
  "manifest_version": 2,
  "name": "Pin Tabs",
  "permissions": [
    "tabs"
  ],
  "version": "1.0.1resigned1"
}