Examine source code of AppliCat

{
  "manifest_version": 2,
  "name": "AppliCat",
  "version": "2.10.2",
  "description": "Stop retyping the same info on every job application. AppliCat learns as you apply and fills it in next time.",
  "browser_specific_settings": {
    "gecko": {
      "id": "applicat@jonathangoldner.com",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "permissions": [
    "storage",
    "activeTab",
    "*://*.myworkdayjobs.com/*",
    "*://*.workday.com/*",
    "*://*.greenhouse.io/*",
    "*://*.greenhouse.com/*",
    "*://*.ashbyhq.com/*",
    "*://*.lever.co/*",
    "*://*.jobs.netflix.net/*",
    "*://*.icims.com/*",
    "*://*.oraclecloud.com/hcmUI/CandidateExperience/*",
    "*://*/hcmUI/CandidateExperience/*"
  ],
  "background": {
    "scripts": [
      "background/worker.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.myworkdayjobs.com/*",
        "*://*.workday.com/*",
        "*://*.greenhouse.io/*",
        "*://*.greenhouse.com/*",
        "*://*.ashbyhq.com/*",
        "*://*.lever.co/*",
        "*://*.jobs.netflix.net/*",
        "*://*.icims.com/*",
        "*://*.oraclecloud.com/hcmUI/CandidateExperience/*",
        "*://*/hcmUI/CandidateExperience/*"
      ],
      "js": [
        "content/detector.js",
        "content/toast.js",
        "content/autofill.js"
      ],
      "css": [
        "content/toast.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_action": {
    "default_popup": "popup/popup.html",
    "default_title": "AppliCat",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  }
}