Examine source code of Theater Mode

{
  "version": "0.1.7",
  "manifest_version": 3,
  "name": "Theater Mode",
  "homepage_url": "https://mybrowseraddon.com/theater-mode.html",
  "description": "Simply focus on the video with theater mode addon.",
  "permissions": [
    "storage",
    "scripting",
    "activeTab",
    "contextMenus"
  ],
  "commands": {
    "_execute_action": {}
  },
  "options_ui": {
    "open_in_tab": true,
    "page": "data/options/options.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "142.0",
      "id": "{01b66b2d-ff23-4226-a0b0-8d0fe57438b7}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "lib/config.js",
      "lib/chrome.js",
      "lib/runtime.js",
      "lib/common.js"
    ]
  },
  "web_accessible_resources": [
    {
      "matches": [
        "*://*/*"
      ],
      "resources": [
        "data/content_script/page_context/theater_1.css",
        "data/content_script/page_context/theater_2.css",
        "data/content_script/page_context/theater_3.css",
        "data/content_script/page_context/theater_4.css",
        "data/content_script/page_context/theater_5.css",
        "data/content_script/page_context/theater_6.css",
        "data/content_script/page_context/theater_7.css",
        "data/content_script/page_context/theater_general.css"
      ]
    }
  ],
  "action": {
    "default_title": "Theater Mode",
    "default_icon": {
      "16": "data/icons/16.png",
      "32": "data/icons/32.png",
      "48": "data/icons/48.png",
      "64": "data/icons/64.png"
    }
  },
  "icons": {
    "16": "data/icons/16.png",
    "32": "data/icons/32.png",
    "48": "data/icons/48.png",
    "64": "data/icons/64.png",
    "128": "data/icons/128.png"
  }
}