Examine source code of TubeBR

{
  "name": "TubeBR",
  "description": "This extension change Youtube UI",
  "version": "4.2",
  "default_locale": "en",
  "manifest_version": 2,
  "content_scripts": [
    {
      "run_at": "document_end",
      "matches": [
        "*://www.youtube.com/*",
        "https://www.youtube-nocookie.com/embed/"
      ],
      "js": [
        "script.js",
        "ryd.content-script.js",
        "./js/content.js"
      ],
      "css": [
        "themeStyles.css",
        "content-style.css",
        "content.css",
        "shared.css",
        "./libs/Source+Sans+Pro.css",
        "popup.css"
      ],
      "all_frames": true
    }
  ],
  "externally_connectable": {
    "matches": [
      "*://*.youtube.com/*"
    ]
  },
  "icons": {
    "128": "youtube_128x128.png"
  },
  "web_accessible_resources": [
    "themeStyles.css",
    "ryd.script.js",
    "*://www.youtube.com/*",
    "icons/LogoSponsorBlocker256px.png",
    "icons/IconSponsorBlocker256px.png",
    "icons/PlayerStartIconSponsorBlocker.svg",
    "icons/PlayerStopIconSponsorBlocker.svg",
    "icons/PlayerUploadIconSponsorBlocker.svg",
    "icons/PlayerUploadFailedIconSponsorBlocker.svg",
    "icons/PlayerCancelSegmentIconSponsorBlocker.svg",
    "icons/clipboard.svg",
    "icons/settings.svg",
    "icons/pencil.svg",
    "icons/check.svg",
    "icons/check-smaller.svg",
    "icons/upvote.png",
    "icons/downvote.png",
    "icons/thumbs_down.svg",
    "icons/thumbs_down_locked.svg",
    "icons/thumbs_up.svg",
    "icons/help.svg",
    "icons/report.png",
    "icons/close.png",
    "icons/skipIcon.svg",
    "icons/refresh.svg",
    "icons/beep.ogg",
    "icons/pause.svg",
    "icons/stop.svg",
    "icons/skip.svg",
    "icons/heart.svg",
    "icons/visible.svg",
    "icons/not_visible.svg",
    "icons/sort.svg",
    "icons/money.svg",
    "icons/segway.png",
    "icons/close-smaller.svg",
    "icons/right-arrow.svg",
    "icons/campaign.svg",
    "icons/star.svg",
    "icons/lightbulb.svg",
    "icons/bolt.svg",
    "icons/stopwatch.svg",
    "icons/music-note.svg",
    "icons/import.svg",
    "icons/export.svg",
    "icons/PlayerInfoIconSponsorBlocker.svg",
    "icons/PlayerDeleteIconSponsorBlocker.svg",
    "icons/dearrow.svg",
    "popup.html",
    "popup.css",
    "content.css",
    "shared.css",
    "js/document.js",
    "libs/Source+Sans+Pro.css",
    "libs/6xKydSBYKcSV-LCoeQqfX1RYOo3ig4vwlxdu.woff2",
    "libs/6xKydSBYKcSV-LCoeQqfX1RYOo3ig4vwmRduz8A.woff2",
    "libs/6xKydSBYKcSV-LCoeQqfX1RYOo3ig4vwmBduz8A.woff2",
    "libs/6xKydSBYKcSV-LCoeQqfX1RYOo3ig4vwlBduz8A.woff2"
  ],
  "permissions": [
    "storage",
    "https://sponsor.ajay.app/*",
    "https://*.youtube.com/*"
  ],
  "optional_permissions": [
    "*://*/*",
    "declarativeContent",
    "webNavigation"
  ],
  "background": {
    "scripts": [
      "./js/background.js"
    ],
    "persistent": false
  },
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e46500a3-cddd-43c0-9bc3-e944589cbd79}"
    }
  }
}