Firefox 55 beta package is ready for testing :
mozilla-firefox-55.0b6-x86_64-1Z.txz
New
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Browsing sessions with a high number of tabs are now restored in an instant
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Search suggestions are now enabled by default for users who haven't explicitly opted-out
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Use virtual reality devices with the web with the introduction of WebVR
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Simplify print jobs from within print preview
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Assign custom shortcuts to Firefox menu items on OS X and macOS via System Preferences > Keyboard > Shortcuts
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Added Belarusian (be) locale
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Make screenshots
of webpages, and save them locally or upload them to the cloud. This
feature will undergo A/B testing and will not be visible for some users.
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Fine-tune your browser performance from the Preferences/Options page.
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Sidebar (bookmarks, history, synced tabs) can now be moved to the right edge of the window
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Search with any installed search engine directly from the location bar
Changed
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The Flash plugin is now click-to-activate by default and only
allowed on http:// and https:// URL schemes. This change will be rolled
out progressively and so will not be visible to all users immediately.
For more information see the Firefox plugin roadmap
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Breaking profile changes - do not downgrade Firefox and use a profile that has been opened with Firefox 55+.
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Modernized application update UI to be less intrusive and more
aligned with the rest of the browser. Only users who have not restarted
their browser 8 days after downloading an update or users who opted out
of automatic updates will see this change.
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Insecure sites can no longer access the Geolocation APIs to get access to your physical location
Have fun :)