I don't know if firefox for android supports this, but as an alternative to epub, you could use the maff (webarchive) format to download a website as one file.
A little bit more work: just save the webpage and convert the html with calibre to epub. To make the file look clean, you could just use the build in read modus from firefox or use readability.
Speeaking of readability, I now think that has the ability you seek, but as a mobi (which couldbe converted easily by calibre). I think you can use readability as a webservice, which would make it independent of the device and platform. There should be a bookmarklet to for it, which should make using it even easier and should work in many browsers.
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