Examine source code of FireAlias

{
  "manifest_version": 2,
  "name": "FireAlias",
  "version": "1.5",
  "description": "Create aliases for websites.",
  "icons": {
    "16": "icon.png",
    "24": "icon.png",
    "32": "icon.png",
    "48": "icon.png"
  },
  "omnibox": {
    "keyword": "goto"
  },
  "browser_action": {
    "default_icon": {
      "16": "icon.png",
      "24": "icon.png",
      "32": "icon.png",
      "48": "icon.png"
    },
    "default_title": "FireAlias",
    "default_popup": "index.html"
  },
  "permissions": [
    "storage"
  ],
  "background": {
    "scripts": [
      "./background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "firealias@brent-rb.github",
      "strict_min_version": "58.0"
    }
  }
}