Examine source code of Twttr

{
  "name": "Twttr",
  "short_name": "Twitter",
  "description": "Twttr streamlines your twitter surfing process by prioritizing user-friendly features. Let's make twitter great again!",
  "version": "1.0.1",
  "manifest_version": 2,
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "css": [
        "./css/twttr.css"
      ],
      "js": [
        "applyOptions.js",
        "utils.js",
        "./scripts/autoplayblock.js"
      ],
      "matches": [
        "https://twitter.com/*",
        "https://*.twitter.com/*"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_action": {
    "default_icon": {
      "500": "icon/500.png"
    }
  },
  "icons": {
    "500": "icon/500.png"
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Alt+Shift+T",
        "mac": "MacCtrl+Shift+T"
      },
      "description": "Opens Twttr"
    }
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  }
}