You can access Share in the Page Actions menu More seamless sharing on Windows: Windows users can now share web pages using the native sharing experience. (Clang LTO was enabled for Windows users in Firefox 63.) Improved performance for Mac and Linux users, by enabling link time optimization (Clang LTO).
Easier performance management: The new Task Manager page found at about:performance lets you see how much energy each open tab consumes and provides access to close tabs to conserve power
Enhanced tab management: You can now select multiple tabs from the tab bar and close, move, bookmark, or pin them quickly and easily Better recommendations: You may see suggestions in regular browsing mode for new and relevant Firefox features, services, and extensions based on how you use the web (for US users only)
