Examine source code of Latin Lookup

{
  "name": "Latin Lookup",
  "version": "1.0.1",
  "manifest_version": 3,
  "browser_specific_settings": {
    "gecko": {
      "id": "latin-lookup@ormpjed.org"
    }
  },
  "description": "Double click or copy a word to parse with Perseus, then look up on Wiktionary.",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {},
  "icons": {
    "16": "loogoo.png"
  },
  "permissions": [
    "scripting",
    "activeTab",
    "clipboardRead"
  ]
}