Examine source code of Receptify

{
  "manifest_version": 2,
  "name": "Receptify",
  "version": "0.12",
  "description": "Many recipe website contain a lot of background information that the user is not interested in. This add-on removes this and boils the recipe down to its core, an ingredients list and step by step instructions.\n\nInstructions:\n1) Go to recipe website\n2) Click on the Receptify icon in the top right of your browser window and select \"Receptify\"\n3) If the website is compatible it turns into a list of ingredients with check boxes and instructions, similar to the screenshot below.\n4) Check off ingredients you already have at home\n5) Click on the Receptify icon in the top right of your browser again and select \"Send to mail\". This opens your standard email client installed on your device and prepares an email with ingredients you're missing to send to yourself as a shopping list. This functionality requires an email client installed and configured.\n6) To reset the webpage click on the Receptify icon and select \"Reset\"\n\nI try to maximise compatibility, here is a list of websites confirmed to work:\nhttps://downshiftology.com\nhttps://gatheringdreams.com\nhttps://www.recipetineats.com\nhttps://cookieandkate.com\n\nPlease contact me with feedback, feature requests and websites you would like to see be added to the compatibility list.",
  "summary": "Reduces recipe websites to the essentials by removing the preamble. Websites that were tested: https://downshiftology.com https://gatheringdreams.com https://www.recipetineats.com https://cookieandkate.com",
  "icons": {
    "30": "icons/pan-30.png",
    "256": "icons/pan-256.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icons/pan-256.png",
    "default_title": "Receptify",
    "default_popup": "popup/popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{32e288f2-695f-4e37-9009-5eaec73242a6}"
    }
  }
}