Examine source code of Review Lens

{
  "name": "Review Lens - Visual Feedback For UI Reviews",
  "version": "1.0.5",
  "description": "Draw, annotate and comment directly on-top of your website's UI, then instantly post your feedback to a merge or pull request.",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "clipboardWrite",
    "activeTab",
    "<all_urls>"
  ],
  "browser_action": {
    "default_title": "Review Lens - Visual Feedback For UI Reviews"
  },
  "manifest_version": 2,
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ec12d5ac-fda3-42fc-aa29-20829af65ce0}"
    }
  }
}