Examine source code of RedditRecipes

{
  "manifest_version": 2,
  "name": "RedditRecipes",
  "version": "0.2resigned1",
  "description": "Adds the ability to save and catalog recipes from Reddit",
  "browser_action": {
    "default_icon": {
      "19": "icons/recipe.png",
      "38": "icons/recipe.png"
    },
    "default_title": "Recipes"
  },
  "icons": {
    "48": "icons/recipe.png"
  },
  "permissions": [
    "storage",
    "tabs"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.reddit.com/r/ketorecipes*"
      ],
      "js": [
        "recipes.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "recipes_bg.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{81c8237e-c6c0-419b-b928-8fd430956ff0}"
    }
  }
}