Examine source code of SF Tabs

{
  "manifest_version": 3,
  "name": "SF Tabs",
  "version": "3.0.1",
  "description": "Add custom navigation tabs to the Salesforce Setup menu for quick access to the pages you use most.",
  "author": "Chris Rouse",
  "homepage_url": "https://github.com/chrisrouse/sftabs",
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "sftabs@github.chrisrouse",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "activeTab",
    "storage",
    "tabs"
  ],
  "host_permissions": [
    "*://*.lightning.force.com/*",
    "*://*.salesforce-setup.com/*",
    "*://*.my.salesforce-setup.com/*",
    "*://*.my.salesforce.com/*",
    "*://*.builder.salesforce-experience.com/*"
  ],
  "action": {
    "default_icon": {
      "16": "icons/sftabs_v3_full_16.png",
      "32": "icons/sftabs_v3_full_32.png",
      "48": "icons/sftabs_v3_full_48.png",
      "96": "icons/sftabs_v3_full_96.png"
    },
    "default_title": "SF Tabs",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.lightning.force.com/*",
        "*://*.salesforce-setup.com/*",
        "*://*.my.salesforce-setup.com/*",
        "*://*.my.salesforce.com/*",
        "*://*.builder.salesforce-experience.com/*"
      ],
      "js": [
        "popup/js/shared/browser-compat.js",
        "popup/js/shared/constants.js",
        "popup/js/shared/utils.js",
        "content/env-banner.js",
        "content/favicon.js",
        "content/floating-button.js",
        "content/floating-modal.js",
        "content/header-menu.js"
      ],
      "css": [
        "content/floating-button.css",
        "content/header-menu.css",
        "content/tab-colors.css",
        "content/env-banner.css"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "*://*.lightning.force.com/lightning/setup/*",
        "*://*.salesforce-setup.com/lightning/setup/*",
        "*://*.my.salesforce-setup.com/lightning/setup/*",
        "*://*.my.salesforce.com/lightning/setup/*"
      ],
      "js": [
        "content/navigation-parser.js",
        "content/tab-renderer.js",
        "content/content-main.js"
      ],
      "run_at": "document_idle",
      "css": [
        "content/tab-colors.css"
      ]
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "content/inject.js",
        "icons/invert.svg",
        "icons/sftabs-icon-16.png",
        "icons/sftabs-logo.svg"
      ],
      "matches": [
        "*://*.lightning.force.com/*",
        "*://*.salesforce-setup.com/*",
        "*://*.my.salesforce-setup.com/*",
        "*://*.my.salesforce.com/*",
        "*://*.builder.salesforce-experience.com/*"
      ]
    }
  ],
  "icons": {
    "16": "icons/sftabs_v3_full_16.png",
    "32": "icons/sftabs_v3_full_32.png",
    "48": "icons/sftabs_v3_full_48.png",
    "96": "icons/sftabs_v3_full_96.png",
    "128": "icons/sftabs_v3_full_128.png"
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  },
  "commands": {
    "open-tab-01": {
      "description": "Tab 1"
    },
    "open-tab-02": {
      "description": "Tab 2"
    },
    "open-tab-03": {
      "description": "Tab 3"
    },
    "open-tab-04": {
      "description": "Tab 4"
    },
    "open-tab-05": {
      "description": "Tab 5"
    },
    "open-tab-06": {
      "description": "Tab 6"
    },
    "open-tab-07": {
      "description": "Tab 7"
    },
    "open-tab-08": {
      "description": "Tab 8"
    },
    "open-tab-09": {
      "description": "Tab 9"
    },
    "open-tab-10": {
      "description": "Tab 10"
    }
  },
  "background": {
    "scripts": [
      "popup/js/shared/constants.js",
      "popup/js/shared/utils.js",
      "background.js"
    ]
  }
}