1. Undo Closed Tabs Button
restores closed tabs
2. NetVideohunter Video Downloader
web video download plug-in, download should only be supported by ESR version of Firefox
3. Video DownloadHelper
web video download plug-in, the new Quantum version also supports
4, Country Flags & IP Whois
displays the country where the website server is located by the flag icon, and the IP address can be displayed by hovering the mouse. Left and right clicks also have many functions (such as using Google to translate the entire web page), and there is more room for freedom.
