Examine source code of TabbyNotes

{
  "manifest_version": 2,
  "name": "TabbyNotes",
  "description": "Notes taking extention with tabs using local storage",
  "version": "4.0.0",
  "browser_action": {
    "default_popup": "index.html",
    "default_title": "Simple notes taking extension"
  },
  "icons": {
    "16": "kitty.png",
    "48": "kitty.png",
    "128": "kitty.png"
  },
  "content_security_policy": "script-src 'self' 'sha256-rkTb15qUZNrKoaKNKjLcVI0tnem580klo1J1DbTsPBg='; object-src 'self'",
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{ce3ec063-c416-458e-ab4b-7701f3f439bf}"
    }
  }
}