Examine source code of BookmarkBucket

{
  "manifest_version": 2,
  "name": "BookmarkBucket",
  "version": "1.0.6",
  "description": "Collect your bookmarks in one place & read them later!",
  "browser_action": {
    "default_icon": "icon128.png",
    "default_popup": "popup.html",
    "default_title": "BookmarkBucket"
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "permissions": [
    "tabs",
    "storage",
    "activeTab",
    "https://utils.li/*",
    "http://localhost:8000/*"
  ]
}