Examine source code of Red YT Progress Bar

{
  "manifest_version": 2,
  "name": "Red YT Progress Bar",
  "description": "Remove the pink transition towards the end of the YouTube progress bar.",
  "version": "1.1",
  "browser_action": {
    "default_popup": "index.html",
    "default_icon": "noPinkIcon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "redYTScrub@5dc38a0f-e52e-403e-b6a5-62941c96d09a"
    }
  },
  "permissions": [
    "storage",
    "activeTab",
    "tabs",
    "*://*.youtube.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "128": "noPinkIcon.png"
  }
}