Text to Speech

	A	B	C	D	E
1	#	Test Case	Steps		Expected result
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3	1	Speech synthesis correctly works on several demo pages	1.1	Launch Firefox.
4			1.2	Open a demo page.
5			1.3	Type some long text and click the "Speak" button.	Speech synthesis correctly starts.
6			1.4	Try out all the available options: Volume, Rate, Pitch	The options work as expected.
7	2	Verify the "media.webspeech.synth.enabled" pref	2.1	Launch Firefox.
8			2.2	Go to about:config page.
9			2.3	Verify the "media.webspeech.synth.enabled" pref	The pref is set to True by default (on Nightly 46) and on False (on Aurora 45)
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