In the coming months Mozilla will launch support for an open ecosystem of extensions on Firefox for Android on addons.mozilla.org (AMO). We’ll announce a definite ...
It did, then came the big rewrite, and nearly all extensions went away. Some eventually came back, but Singlefile never did; there's no longer any way to save the html of a site you visit. So I keep Iceraven, which still supports the addons that firefox used to.