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Hi, my website's (www.gasciunai.joniskis.lm.lt) sub menu stop working after you upgrade firefox in latest version (49). P.S. with other browsers works perfect.

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I think Firefox 49 is broken.

I think Firefox 49 is broken.

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I also experience this issue.

I reported this issue to the Webcompat team. They will likely have more details about the issue for you. Please refer to issue #3307.