Examine source code of Language Lookup!

{
  "manifest_version": 2,
  "name": "Language Lookup!",
  "version": "1.2resigned1",
  "description": "Highlight a word or phrase, right click it, then choose its language to look up its definition in that language!",
  "homepage_url": "https://github.com/wanderrful",
  "icons": {
    "48": "icons/icon-48.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "contextMenus",
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{4f32d73f-ae06-4ca0-91bc-593aa2b29217}"
    }
  }
}