Examine source code of Specpin

{
  "manifest_version": 2,
  "name": "__MSG_extName__",
  "description": "__MSG_extDescription__",
  "version": "0.0.17",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "128": "icon/128.png"
  },
  "default_locale": "en",
  "permissions": [
    "storage",
    "activeTab",
    "tabs",
    "alarms",
    "contextMenus",
    "http://127.0.0.1/*",
    "http://localhost/*"
  ],
  "optional_permissions": [
    "https://*/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "specpin@ohnice.app",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "browser_action": {
    "default_icon": {
      "16": "icon/16.png",
      "32": "icon/32.png",
      "48": "icon/48.png",
      "128": "icon/128.png"
    },
    "default_title": "Specpin",
    "default_popup": "popup.html"
  },
  "web_accessible_resources": [
    "fonts/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "open_in_tab": true,
    "page": "options.html"
  },
  "sidebar_action": {
    "default_panel": "sidepanel.html",
    "default_title": "Specpin"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "content-scripts/content.js"
      ]
    }
  ]
}