Examine source code of BSL Tab

{
  "manifest_version": 2,
  "name": "BSL Tab",
  "description": "Learn British Sign Language with each new tab.",
  "version": "1.0",
  "icons": {
    "128": "icons/icon128.png"
  },
  "browser_action": {
    "default_popup": "index.html",
    "default_icon": "icons/icon128.png"
  },
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "permissions": [
    "storage"
  ],
  "web_accessible_resources": [
    "media/*",
    "flashcards/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{41191a35-d4c3-42f7-9093-51d6ee697dcc}"
    }
  }
}