Examine source code of Mobile2Desktop

{
  "manifest_version": 2,
  "name": "Mobile2Desktop",
  "version": "1.3.3resigned1",
  "description": "Changes mobile websites to desktop ones.",
  "icons": {
    "48": "icons/m2d-48.png"
  },
  "applications": {
    "gecko": {
      "id": "nemoload@aol.com",
      "strict_min_version": "45.0"
    }
  },
  "permissions": [
    "activeTab"
  ],
  "background": {
    "scripts": [
      "mobile_to_normal.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/m2d-32.png",
    "default_title": "Mobile2Desktop"
  }
}