The official release will be in 24 hours from now, but Mozilla has uploaded the binaries to their CDNs.

Partial Release Notes:
# NEW
-You can now unload tabs by right-clicking on a tab (or multiple selected tabs) and selecting "Unload Tab". This can be helpful in reducing Firefox's memory and CPU usage.

-Firefox for Android now allows includes a "Select All" in Bookmarks.

-Vertical Tabs: You can now keep more — or fewer — pinned tabs in view. Just drag the divider to resize your pinned tabs section.

-Firefox now supports adding custom search engines. To do so, right-click a search field of a supported website and select Add Search Engine, or go to Settings > Search > Add (below the search shortcuts table) to manually enter a search URL.

-The Firefox Extensions button can now be removed from the toolbar, giving you more control over how you customize your browser. When the button is hidden, you can access the extensions panel again at any time from the Firefox menu by clicking the Extensions menu item.

-Firefox builds in Arabic now come with a built-in Arabic dictionary for the Firefox spellchecker.

-You can now lock your private browsing tabs behind your fingerprint or device credentials for added privacy. Enable the setting in Firefox for Android to keep your private tabs secure even when you leave the app.

-Full-Page Translations now prioritize translating only the content near your current view, improving speed and responsiveness. Content outside your view is skipped unless you scroll to it, reducing unnecessary resource usage.

# CHANGED
-The Pocket toolbar icon, as well as the Pocket integrations on New Tab, have been removed per the service shutdown announcement.