Examine source code of Yeah! for Twitter

{
  "name": "Yeah! for Twitter",
  "description": "Adds a Yeah! button to Twitter",
  "version": "1.1.4",
  "manifest_version": 2,
  "homepage_url": "https://github.com/dimdenGD/YeahTwitter",
  "permissions": [
    "storage",
    "webRequest",
    "webRequestBlocking",
    "*://*.twitter.com/*",
    "*://twitter.com/*",
    "*://twimg.com/*",
    "*://*.twimg.com/*",
    "*://x.com/*",
    "*://*.x.com/*",
    "*://*.dimden.dev/*"
  ],
  "web_accessible_resources": [
    "images/*",
    "styles/*",
    "fonts/*"
  ],
  "icons": {
    "16": "/images/logo16.png",
    "32": "/images/logo32.png",
    "48": "/images/logo48.png",
    "128": "/images/logo128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://twitter.com/*",
        "https://x.com/*"
      ],
      "js": [
        "scripts/purify.min.js",
        "scripts/api.js",
        "scripts/helpers.js",
        "scripts/tweetrenderer.js",
        "scripts/content.js"
      ],
      "all_frames": true,
      "run_at": "document_end"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "yeah@dimden.dev",
      "strict_min_version": "101.0"
    },
    "gecko_android": {
      "strict_min_version": "101.0"
    }
  },
  "browser_action": {
    "default_icon": {
      "128": "/images/logo128.png"
    },
    "default_title": "Extension settings",
    "default_popup": "popup.html"
  }
}