Examine source code of KDE Activities

{
  "manifest_version": 2,
  "name": "KDE Activities",
  "version": "1.0.1resigned1",
  "description": "Adds support for KDE Activities.",
  "background": {
    "scripts": [
      "activities.js"
    ]
  },
  "permissions": [
    "nativeMessaging",
    "tabs",
    "<all_urls>"
  ],
  "applications": {
    "gecko": {
      "id": "KdeActivitiesFirefoxAddon@addon.scheirle.de",
      "strict_min_version": "50.0"
    }
  }
}