Hello there Vstepaniuk We have read your message We try to help you. you have sent a message to Thunderbird support. A desktop notification for RSS feeds on your Linux device 18.4? https://support.mozilla.org/en-US/kb/how-subscribe-news-feeds-and-blogs This article applies to Thunderbird 52 and above. This is for Windows. (Scanned) For Linux 18.04 Ubuntu : You can try Newsbeuter : https://zoomadmin.com/HowToInstall/UbuntuPackage/newsbeuter This software notificates RSS feeds to desktops. greetings Firefox Volunteer.

Hello there again https://www.seamonkey-project.org/releases/ https://addons.thunderbird.net/nl/seamonkey/addon/rss-icon-in-url-bar/ You can run Seamonkey in to Linux. And use the add-on.