Examine source code of Steam Activity Filter

{
  "manifest_version": 2,
  "name": "Steam Activity Filter",
  "short_name": "SAF",
  "author": "ZeroUnderscoreOu",
  "version": "1.4.1resigned1",
  "homepage_url": "http://steamcommunity.com/groups/0_oWassup/discussions/3/",
  "icons": {
    "16": "Logo16.png",
    "48": "Logo48.png",
    "128": "Logo128.png"
  },
  "applications": {
    "gecko": {
      "id": "@steamactivityfilter"
    }
  },
  "description": "Filter for friends' activity in Steam. Allows to load activity for selected days and display needed part of it.",
  "content_scripts": [
    {
      "matches": [
        "*://steamcommunity.com/*/home*"
      ],
      "js": [
        "data/Index.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "data/SteamActivityFilter.js"
  ]
}