Examine source code of Feedly tabs Q

{
  "manifest_version": 2,
  "name": "Feedly tabs",
  "description": "Open Feedly articles in new tabs",
  "icons": {
    "16": "images/icon16.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "version": "0.5.0",
  "permissions": [
    "tabs",
    "http://*.feedly.com/home*",
    "https://*.feedly.com/home*"
  ],
  "page_action": {
    "default_icon": {
      "19": "images/icon19.png",
      "38": "images/icon38.png"
    },
    "default_title": "Open Feedly articles in new tabs"
  },
  "content_scripts": [
    {
      "matches": [
        "https://feedly.com/*"
      ],
      "js": [
        "js/inject_action_button.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8f422d56-ba9d-4642-b82d-b58fe2f07efb}"
    }
  }
}