Examine source code of Resource Saver

{
  "manifest_version": 2,
  "name": "Resource Saver",
  "version": "0.33",
  "description": "Dramatically improves Suspend feature by enabling it to retain some data on suspended tabs, and also by tracking their importance and letting you suspend the least important with a single click, letting you swiftly save RAM/CPU and then just as easily return to your tabs when you left off.",
  "browser_specific_settings": {
    "gecko": {
      "id": "{324694ab-7243-49ce-9eb7-772758632a8d}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "tabs",
    "storage",
    "webNavigation",
    "contextMenus",
    "<all_urls>"
  ],
  "browser_action": {
    "default_icon": {
      "16": "Icons/RS_16.png",
      "32": "Icons/RS_32.png",
      "48": "Icons/RS_48.png",
      "128": "Icons/RS_128.png"
    },
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "16": "Icons/RS_16.png",
    "32": "Icons/RS_32.png",
    "48": "Icons/RS_48.png",
    "128": "Icons/RS_128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ]
}