Examine source code of Vidmo

{
  "manifest_version": 2,
  "name": "Vidmo",
  "description": "Video clipping tool",
  "version": "26.6.1",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "64": "icon/64.png",
    "96": "icon/96.png",
    "128": "icon/128.png"
  },
  "permissions": [
    "storage"
  ],
  "web_accessible_resources": [
    "version.html",
    "icon/128.png",
    "Roboto-Regular.ttf",
    "content-scripts/firefox.css"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-scripts/firefox.js"
      ]
    }
  ],
  "browser_action": {
    "default_title": "Vidmo"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{cde4f533-9460-47f5-bd28-1b5cfb7009d1}"
    }
  }
}