Windows includes a speech recognition/dictation program you can use with nearly any application. It floats a bar on the screen, which you can attach top center, to turn on and off speech recognition when you want to use it. I don't use it very often (I have Windows 7), but when I tried it in the past, it wasn't bad. It definitely wants you to enunciate your words. For Windows 8.1, see: http://windows.microsoft.com/en-us/windows-8/using-speech-recognition Since the program (probably) doesn't know the layout of Firefox or web pages, you'll need to click/tap where you want Windows to put the speech input before speaking to it. Does that work?

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