Examine source code of Eclipser — Dark Mode & Night Theme, Media Dimming

{
  "manifest_version": 3,
  "name": "__MSG_extensionName__",
  "short_name": "Eclipser",
  "description": "__MSG_extensionDescription__",
  "version": "0.5.1",
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "extension@eclipser.app",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": [
          "authenticationInfo",
          "personallyIdentifyingInfo",
          "technicalAndInteraction"
        ]
      }
    }
  },
  "icons": {
    "16": "assets/icon-16.png",
    "32": "assets/icon-32.png",
    "48": "assets/icon-48.png",
    "128": "assets/icon-128.png"
  },
  "permissions": [
    "alarms",
    "contextMenus",
    "storage"
  ],
  "optional_permissions": [
    "webNavigation"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background/background.js"
    ]
  },
  "action": {
    "default_title": "Eclipser",
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "assets/icon-16.png",
      "32": "assets/icon-32.png"
    }
  },
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "commands": {
    "toggle-current-site": {
      "suggested_key": {
        "default": "Alt+Shift+2",
        "mac": "Command+Shift+2"
      },
      "description": "__MSG_toggleSiteCommand__"
    },
    "toggle-extension": {
      "suggested_key": {
        "default": "Alt+Shift+3",
        "mac": "Command+Shift+3"
      },
      "description": "__MSG_toggleExtensionCommand__"
    },
    "switch-filtered-mode": {
      "suggested_key": {
        "default": "Alt+Shift+4",
        "mac": "Command+Shift+4"
      },
      "description": "__MSG_filteredModeCommand__"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/main-world.js"
      ],
      "run_at": "document_start",
      "all_frames": true,
      "match_about_blank": true,
      "world": "MAIN"
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/boot.js"
      ],
      "run_at": "document_start",
      "all_frames": true,
      "match_about_blank": true
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/content-script.js"
      ],
      "run_at": "document_start",
      "all_frames": true,
      "match_about_blank": true
    }
  ],
  "content_security_policy": {
    "extension_pages": "default-src 'self'; script-src 'self'; object-src 'none'; frame-src 'self' https:; connect-src https: http:; img-src 'self' data:; style-src 'self'; font-src 'self'; base-uri 'none'; form-action 'none'"
  }
}