Examine source code of BasecampTimeTracker

{
  "manifest_version": 2,
  "author": "Rami El Kudr",
  "name": "BasecampTimeTracker",
  "description": "Adds the possibility to track times for tasks in basecamp classic.",
  "homepage_url": "https://github.com/ritchdevelopement",
  "version": "1.8.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "ritchdevelopement@github.com"
    }
  },
  "icons": {
    "48": "icons/basecamp-48.png"
  },
  "options_ui": {
    "page": "options/options.html",
    "browser_style": true
  },
  "permissions": [
    "storage",
    "<all_urls>"
  ],
  "web_accessible_resources": [
    "images/play_button.png",
    "images/pause_button.png",
    "images/remove_button.png",
    "images/add_button.png",
    "images/minus_button.png",
    "images/example-project-id.png",
    "images/favourite_button.png",
    "images/favourite_button_filled.png"
  ],
  "browser_action": {
    "default_icon": "icons/basecamp-48.png",
    "default_title": "Basecamp Time Tracker",
    "default_popup": "popup/basecamp_tt_popup.html"
  },
  "background": {
    "scripts": [
      "background/basecamp_tt_background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.basecamphq.com/*"
      ],
      "js": [
        "basecamp_tt.js"
      ],
      "css": [
        "basecamp_tt.css"
      ]
    }
  ]
}