Examine source code of Sift

{
  "manifest_version": 2,
  "name": "Sift",
  "description": "A browser extension for filtering feeds and distracting content on social media",
  "version": "0.2.1",
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{08db9950-75b9-4264-a900-8ce20131614f}",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "permissions": [
    "storage",
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Sift",
    "default_popup": "popup.html"
  },
  "options_ui": {
    "open_in_tab": true,
    "page": "options.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://bsky.app/*"
      ],
      "run_at": "document_start",
      "css": [
        "content-scripts/bsky.css"
      ],
      "js": [
        "content-scripts/bsky.js"
      ]
    },
    {
      "matches": [
        "*://*.facebook.com/*"
      ],
      "run_at": "document_start",
      "css": [
        "content-scripts/facebook.css"
      ],
      "js": [
        "content-scripts/facebook.js"
      ]
    },
    {
      "matches": [
        "*://*.instagram.com/*"
      ],
      "run_at": "document_start",
      "css": [
        "content-scripts/instagram.css"
      ],
      "js": [
        "content-scripts/instagram.js"
      ]
    },
    {
      "matches": [
        "*://*.linkedin.com/*"
      ],
      "run_at": "document_start",
      "css": [
        "content-scripts/linkedin.css"
      ],
      "js": [
        "content-scripts/linkedin.js"
      ]
    },
    {
      "matches": [
        "*://*.pinterest.com/*"
      ],
      "run_at": "document_start",
      "css": [
        "content-scripts/pinterest.css"
      ],
      "js": [
        "content-scripts/pinterest.js"
      ]
    },
    {
      "matches": [
        "*://old.reddit.com/*",
        "*://www.reddit.com/*"
      ],
      "run_at": "document_start",
      "css": [
        "content-scripts/reddit.css"
      ],
      "js": [
        "content-scripts/reddit.js"
      ]
    },
    {
      "matches": [
        "*://substack.com/*"
      ],
      "run_at": "document_start",
      "css": [
        "content-scripts/substack.css"
      ],
      "js": [
        "content-scripts/substack.js"
      ]
    },
    {
      "matches": [
        "*://*.tiktok.com/*"
      ],
      "run_at": "document_start",
      "css": [
        "content-scripts/tiktok.css"
      ],
      "js": [
        "content-scripts/tiktok.js"
      ]
    },
    {
      "matches": [
        "*://m.twitch.tv/*",
        "*://www.twitch.tv/*"
      ],
      "run_at": "document_start",
      "css": [
        "content-scripts/twitch.css"
      ],
      "js": [
        "content-scripts/twitch.js"
      ]
    },
    {
      "matches": [
        "*://*.twitter.com/*",
        "*://*.x.com/*"
      ],
      "run_at": "document_start",
      "css": [
        "content-scripts/twitter.css"
      ],
      "js": [
        "content-scripts/twitter.js"
      ]
    },
    {
      "matches": [
        "*://www.youtube.com/*"
      ],
      "all_frames": true,
      "run_at": "document_start",
      "css": [
        "content-scripts/youtube.css"
      ],
      "js": [
        "content-scripts/youtube.js"
      ]
    },
    {
      "matches": [
        "*://m.youtube.com/*"
      ],
      "run_at": "document_start",
      "css": [
        "content-scripts/youtube_mobile.css"
      ],
      "js": [
        "content-scripts/youtube_mobile.js"
      ]
    },
    {
      "matches": [
        "*://music.youtube.com/*"
      ],
      "run_at": "document_start",
      "css": [
        "content-scripts/youtube_music.css"
      ],
      "js": [
        "content-scripts/youtube_music.js"
      ]
    }
  ]
}