Examine source code of Jimaku Toolbar Button

{
  "manifest_version": 2,
  "name": "jimaku-button",
  "version": "1.0.4",
  "description": "Adds a button to AniList or TMDB pages that have a Jimaku entry",
  "browser_specific_settings": {
    "gecko": {
      "id": "rapptz-jimaku-button-ext-amo@jimaku.cc"
    }
  },
  "icons": {
    "48": "icons/icon.png",
    "96": "icons/icon@2x.png"
  },
  "permissions": [
    "tabs",
    "storage"
  ],
  "page_action": {
    "default_icon": "icons/icon.png",
    "default_title": "Jimaku"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html"
  }
}