Examine source code of Hide Activity Details (+ Tweaks) for Trello

{
  "manifest_version": 2,
  "name": "Hide Activity Details (+ Tweaks) for Trello",
  "description": "Hides activity details on Trello cards. Can now also be set to hide completed checklist items",
  "homepage_url": "http://beingmrkenny.co.uk/web-extensions/hide-activity-trello",
  "author": "Mark Kenny",
  "version": "3.3.1",
  "icons": {
    "16": "Icons/192.png",
    "32": "Icons/192.png",
    "48": "Icons/192.png",
    "64": "Icons/192.png",
    "256": "Icons/256.png"
  },
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "js": [
        "js/classes/Global.js",
        "js/classes/DataStorage.js",
        "js/classes/Options.js",
        "js/classes/Clickers.js",
        "js/classes/LinkLinks.js",
        "js/classes/Process.js",
        "js/functions.js",
        "js/init.js"
      ],
      "matches": [
        "*://trello.com/*"
      ],
      "run_at": "document_start"
    },
    {
      "css": [
        "css/css.css"
      ],
      "matches": [
        "*://trello.com/*"
      ],
      "run_at": "document_start"
    }
  ],
  "options_ui": {
    "page": "options/index.html"
  },
  "browser_action": {
    "default_title": "Hide Activity Details (+ Tweaks) for Trello",
    "default_popup": "options/index.html",
    "default_icon": "Icons/192.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6eb191fe-45f6-4b46-b93d-b74a6323d798}"
    }
  }
}