Examine source code of Rakuten Button Canada: Get Cash Back for Shopping

{
  "name": "Rakuten Canada Button",
  "short_name": "Rakuten",
  "homepage_url": "https://www.rakuten.ca/",
  "author": "Rakuten",
  "description": "Rakuten Canada Button provides automatic Cash Back alerts at participating stores. No hassle. No more missed Cash Back!",
  "permissions": [
    "cookies",
    "tabs",
    "webNavigation",
    "webRequest",
    "storage",
    "<all_urls>"
  ],
  "manifest_version": 2,
  "web_accessible_resources": [
    "js/libs/*.map",
    "img/*.png",
    "img/*.svg",
    "img/*.gif",
    "css/*.css",
    "fonts/*.woff",
    "fonts/*.woff2",
    "fonts/*.ttf",
    "fonts/*.otf"
  ],
  "content_scripts": [
    {
      "all_frames": false,
      "js": [
        "commons/bundle.js",
        "content/bundle.js"
      ],
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_start"
    }
  ],
  "background": {
    "scripts": [
      "commons/bundle.js",
      "bg/bundle.js"
    ],
    "persistent": true
  },
  "options_ui": {
    "page": "settings/settings.html",
    "open_in_tab": true
  },
  "icons": {
    "16": "img/rakuten/icon-32.png",
    "48": "img/rakuten/icon-64.png",
    "128": "img/rakuten/icon-128.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "img/rakuten/icon-32.png",
      "32": "img/rakuten/icon-32.png"
    },
    "default_title": "Rakuten Canada: Get Cash Back For Shopping"
  },
  "version": "7.8.1",
  "browser_specific_settings": {
    "gecko": {
      "id": "ebatesca@ebates.com"
    }
  }
}