Give about:config to Firefox for Android and let us customize it the same way we can customize the desktop browser. That... high level of customization was the only reason I started using Firefox back in 2006 and why I still prefer Firefox for the desktop to any other browser.
I stopped using FF for Android 2 years ago because many pages simply won't load and hang in the middle of loading whereas the same pages open just fine and fast using Opera for Android. Since I was unable to send you feedback about that, I stopped using it. But now with Mozilla Connect I can share my ideas and hopefully bring FF for Android to the same glory its desktop cousin already has.
When I disabled IPv6 on the desktop Firefox last week, many of the pages suddenly started loading instantly bc my ISP, among many others in my country, still supports IPv4 only. So I'm 90% sure that if I can do the same with FF for Android, that will change its performance for the better. But it turned out that the mobile FF didn't have about:config.