欢迎访问 Firefox 附加组件。
There are certain usecases where it won't work such as:
1. Links being redirected by servers.
2. A url is input into the address bar. So if you type in a url in addressbar, this extension will not check for duplicate. I would love to hear feedback on this about whether this should be implemented or not.
3. Undo close tab
Please do rate the extension if you like it and write to me if you have any suggestions.