Examine source code of we were online

{
  "manifest_version": 2,
  "name": "we were online",
  "description": "A quiet portrait of your time online. See who else is here, chat on Wikipedia, and collect traces of where you've been.",
  "version": "0.1.20",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "128": "icon/128.png"
  },
  "permissions": [
    "storage",
    "tabs",
    "alarms",
    "idle",
    "unlimitedStorage",
    "http://*/*",
    "https://*/*"
  ],
  "commands": {
    "open-inventory": {
      "suggested_key": {
        "default": "Ctrl+Shift+B",
        "mac": "Command+Shift+I"
      },
      "description": "Open the we-were-online inventory at the cursor"
    }
  },
  "web_accessible_resources": [
    "content-scripts/content.css",
    "inventory/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "we-were-online@spencerchang.com",
      "data_collection_permissions": {
        "required": [
          "browsingActivity",
          "websiteActivity"
        ],
        "optional": [
          "technicalAndInteraction"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "we were online",
    "default_popup": "popup.html"
  },
  "options_ui": {
    "open_in_tab": true,
    "page": "options.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_idle",
      "css": [
        "content-scripts/content.css"
      ],
      "js": [
        "content-scripts/content.js"
      ]
    }
  ]
}