Examine source code of FlashDroplet

{
  "manifest_version": 2,
  "name": "FlashDroplet",
  "version": "2.2",
  "description": "Capture flash frames from browser videos. Frame-by-frame scrubber, auto flash scan, and custom save location.",
  "browser_specific_settings": {
    "gecko": {
      "id": "flashdroplet-v2@extension",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "icons": {
    "48": "icons/icon48.png",
    "96": "icons/icon96.png"
  },
  "browser_action": {
    "default_icon": "icons/icon48.png",
    "default_popup": "popup/popup.html",
    "default_title": "FlashDroplet – Capture Frame"
  },
  "options_ui": {
    "page": "settings/settings.html",
    "open_in_tab": true
  },
  "background": {
    "scripts": [
      "background/background.js"
    ]
  },
  "permissions": [
    "activeTab",
    "downloads",
    "storage",
    "tabs"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/content.js"
      ],
      "css": [
        "overlay/overlay.css"
      ]
    }
  ],
  "web_accessible_resources": [
    "overlay/overlay.css"
  ]
}