manifest.json

{
    "manifest_version": 2,
    "developer": {
      "name": "Vegard Vines Skjefstad",
      "url": "https://www.vegard.net/find-free-photos-firefox-extension/"
    },
    "name": "Find Free Photos",
    "description": "The Find Free Photos Firefox Extensions let's you quickly search some of the internet's _legal_ sources for free, high quality, royalty free photos.",
    "version": "1.5",
    "applications": {
      "gecko": {
        "strict_min_version": "52.0"
      }
    },
    "background": {
      "scripts": ["background.js"]
    },
    "omnibox": { "keyword" : "ffp" },
    "icons": {
      "48": "icons/camera.svg",
      "64": "icons/camera.svg",
      "96": "icons/camera.svg",
      "128": "icons/camera.svg",
      "256": "icons/camera.svg",
      "512": "icons/camera.svg"
    }
  }