Examine source code of SubredditSearch

{
  "manifest_version": 2,
  "name": "Subreddit Search",
  "author": "Eric Groom",
  "version": "0.2resigned1",
  "description": "Use omnibar to search subreddits",
  "omnibox": {
    "keyword": "sub"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "48": "icons/icon.png",
    "96": "icons/icon@2x.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4de5476a-093e-45b6-ab87-cc6ba61d8418}"
    }
  }
}