Firefox Nightly 57 removed the share feature because it was using a non official API. This extension reimplement the feature, basically a modal window (that is opened in your Firefox toolbar) that let you share to Twitter, LinkedIn, Reddit, Tumblr, GMail, Diaspora, Telegram, VKontakte, Outlook, Pinboard, Yahoo! Mail, Weibo, Shaarli, Mastodon, MeWe, Skype, WhatsApp, Pinterest, Instapaper, Evernote, Scoop.it, Google Translate (Auto>EN), Bing Translator, Viber, Line, KakaoTalk, Internet Wayback Machine, Bluesky, Friendica, Feedly, Threads, Parler social networks. Support also the Container feature and Facebook Container extension. For new services and ideas instead leave a bad review open a ticket on https://github.com/Mte90/Share-Backported The extension require different permission for the Container support.