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Full user review
"Wait until this is out at least a year before using it."
Fast for some purposes.
Breaks all extensions and is unusable as all buttons, toolbars, etc. no longer work as in 3x. I spent weeks simply trying to get 4 to work, now 5 is out, also unusuable.
DO NOT download until they've had it out at least a year and have fixed it!
AT the least, Mozilla should have made all extensions from 3x work with this, out the door.
They also never should have removed functions needed, nor added un-needed ones that were formerly available as add-ons anyway for those who wanted them (such as tiny menu that became the firefox button in 4.)
Worthless. Reinstall 3.x