There’s already Firefox 5 available, but it seems that Mozilla has already started working on the next iteration of the mobile browser, Firefox 6. A beta version of the app has appeared on the Market and clocking in at 14MB, it does seem to be on the hefty side. Here’s what the description says:
New in this release for Android:
New initial experience: Firefox starts faster and uses less memory. Get to your home page quickly and discover browser features on the side panels.
Higher-quality image scaling: View crisp Web pages and images with less pixelation
Enhanced Firefox experience on large screen tablets
Improvements to the form helper on Android
Fresh visual style on Gingerbread OS
Optimization for pages that use right to left layout rendering, e.g. in Hebrew and Arabic
Touch Events for better interaction with Web pages
IndexedDB allows Web pages to store data offline for faster access
Automatic text hyphenation
Personally, I have found Dolphin HD and Maxthon more intuitive than FF5, and consuming less resources, but may be Firefox 6 will win me over. Head over to the Market on your Android phone or install directly from the web to try.