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diff -up mozilla-esr31/browser/confvars.sh.webm-fix mozilla-esr31/browser/confvars.sh
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--- mozilla-esr31/browser/confvars.sh.webm-fix	2014-07-21 13:56:53.522253529 +0200
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+++ mozilla-esr31/browser/confvars.sh	2014-07-21 13:57:49.983533186 +0200
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@@ -65,6 +65,6 @@ MOZ_PAY=1
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 # Enable activities. These are used for FxOS developers currently.
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 MOZ_ACTIVITIES=1
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 MOZ_JSDOWNLOADS=1
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-MOZ_WEBM_ENCODER=1
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+#MOZ_WEBM_ENCODER=1
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 # Enable exact rooting on desktop.
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 JSGC_USE_EXACT_ROOTING=1