Examine source code of easyFlashCards

{
  "manifest_version": 2,
  "name": "easyFlashCards",
  "version": "0.2",
  "description": "Create ankiweb flashcards while browsing web",
  "icons": {
    "48": "icons/efc-48.png"
  },
  "background": {
    "scripts": [
      "easyFlashCards.js"
    ]
  },
  "permissions": [
    "storage",
    "contextMenus",
    "webRequest",
    "webRequestBlocking",
    "cookies",
    "<all_urls>"
  ],
  "browser_action": {
    "default_icon": "icons/efc-32.png",
    "default_title": "easyFlashCards",
    "default_popup": "popup/popup.html"
  },
  "web_accessible_resources": [
    "images/loader.webp"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{82c54037-46e6-4ced-9151-6d992a5e8108}"
    }
  }
}