Examine source code of Flashbang

{
  "manifest_version": 2,
  "name": "Flashbang",
  "version": "2",
  "description": "Dark mode for D2L, Google Docs & Google Drive to ease those weary eyes.",
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "96": "icons/icon96.png",
    "128": "icons/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://docs.google.com/*"
      ],
      "css": [
        "stylesheets/docs.css"
      ],
      "js": [
        "content_scripts/docs.js"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "https://drive.google.com/*"
      ],
      "css": [
        "stylesheets/drive.css"
      ],
      "js": [
        "content_scripts/drive.js"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "https://mycourses2.mcgill.ca/d2l/*",
        "https://learn.georgebrown.ca/d2l/*",
        "https://avenue.mcmaster.ca/d2l/*",
        "https://learn.uwaterloo.ca/d2l/*",
        "https://courses.torontomu.ca/d2l/*"
      ],
      "css": [
        "stylesheets/d2l.css"
      ],
      "js": [
        "content_scripts/d2l.js"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_action": {
    "browser_style": true,
    "default_title": "Flashbang"
  },
  "options_ui": {
    "page": "./hueChanger/hue.html",
    "browser_style": true
  },
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{64c14c75-c301-4427-bc42-c0384b216f5e}"
    }
  }
}