Examine source code of Writing

{
  "name": "Writing",
  "description": "Write anything with this addons",
  "icons": {
    "128": "icon.png"
  },
  "version": "0.2.1",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "manifest_version": 2,
  "browser_action": {},
  "browser_specific_settings": {
    "gecko": {
      "id": "{265e7d98-a51a-407a-9f42-175186dd1e3a}"
    }
  }
}