Examine source code of Marcy's Trigger Guard

{
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    "default_popup": "html/popup.html",
    "default_title": "Marcy's Trigger Guard"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "mtg@mxmbrook.co.uk",
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  "content_scripts": [
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      "js": [
        "js/common.js",
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      ],
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_start"
    },
    {
      "js": [
        "js/common.js",
        "js/content.js"
      ],
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_idle"
    }
  ],
  "background": {
    "scripts": [
      "js/common.js",
      "js/background.js"
    ]
  },
  "options_ui": {
    "page": "html/options.html",
    "open_in_tab": true
  },
  "content_security_policy": "default-src 'self'",
  "description": "Removes custom text from sight. By Marcy.",
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "64": "icons/icon-64.png",
    "128": "icons/icon-128.png"
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  "manifest_version": 2,
  "name": "Marcy's Trigger Guard",
  "homepage_url": "https://github.com/SpruceMarcy/Marcy-s-Trigger-Guard",
  "permissions": [
    "storage",
    "contextMenus"
  ],
  "version": "2.0.0"
}