URL Bulk Opener

Automatically open a list of URLs in new tabs with a custom delay between each.
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manifest.json
{
  "manifest_version": 2,
  "name": "__MSG_pluginName__",
  "version": "1.0",
  "description": "__MSG_description__",
  "permissions": [],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "{72aaeb9e-1d01-4932-a7c2-c2b2fe40d68a}"
    }
  }
}