Put-Call Parity

manifest.json

{
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  "manifest_version": 2,
  "name": "Put-Call Parity",
  "version": "1.3.1",
  "description": "A mental mathematics tool for understanding and mastering put-call parity.",
  "icons": {
    "128": "icons/put-call_parity_128.png"
  },
  "browser_action": {
    "default_popup": "index.html",
    "default_title": "Put-Call Parity",
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      "19": "icons/put-call_parity_19.png",
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  "permissions": [
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  "content_scripts": [
    {
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        "https://*/*"
      ],
      "js": [
        "javascripts/DS_STORE.js"
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    }
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}