Examine source code of Pinboard Pin

{
  "manifest_version": 2,
  "name": "Pinboard Pin",
  "version": "0.5.0",
  "description": "A web extension for pinning pages on Pinboard (pinboard.in) with Firefox.",
  "homepage_url": "https://github.com/Cito/Pinboard-Pin",
  "options_ui": {
    "page": "/index.html?page=options"
  },
  "icons": {
    "16": "/img/pinboard_16.png",
    "24": "/img/pinboard_24.png",
    "32": "/img/pinboard_32.png",
    "48": "/img/pinboard_48.png",
    "64": "/img/pinboard_64.png",
    "96": "/img/pinboard_96.png",
    "128": "/img/pinboard_128.png",
    "256": "/img/pinboard_256.png"
  },
  "background": {
    "page": "/index.html?page=background"
  },
  "browser_action": {
    "default_title": "Pinboard Pin",
    "default_icon": {
      "16": "/img/pinboard_idle_16.png",
      "24": "/img/pinboard_idle_24.png",
      "32": "/img/pinboard_idle_32.png",
      "48": "/img/pinboard_idle_48.png",
      "64": "/img/pinboard_idle_64.png",
      "96": "/img/pinboard_idle_96.png",
      "128": "/img/pinboard_idle_128.png",
      "256": "/img/pinboard_idle_256.png"
    },
    "default_popup": "/index.html"
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Alt+Shift+P"
      },
      "description": "Save page to Pinboard"
    }
  },
  "permissions": [
    "storage",
    "tabs",
    "contextMenus",
    "*://*/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{981c6263-af64-47c6-8c6d-c3289444fdf9}",
      "data_collection_permissions": {
        "required": [
          "browsingActivity",
          "websiteContent"
        ]
      }
    }
  }
}