Examine source code of Board: Papier for Firefox

{
  "manifest_version": 2,
  "name": "Board",
  "description": "Just start typing to scribble anything on the board, use it as todo, planning pad, notes anything.",
  "version": "1.10resigned1",
  "homepage_url": "https://github.com/tsl143/board",
  "icons": {
    "32": "icons/logo_32.png",
    "48": "icons/logo_48.png",
    "64": "icons/logo_64.png"
  },
  "web_accessible_resources": [
    "index.html",
    "editor/*"
  ],
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "chrome_settings_overrides": {
    "homepage": "index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{df4d1312-5fee-4449-9eff-d96ef39ed358}"
    }
  }
}