Nope, it's so slow it's unusable - that's on a freshly booted stock device and very few apps running. Fennec continues to use CPU (15-20%) even when minimized and sitting on the opening home page - this is inexcusable. Loading up a basic staple such as news.bbc.co.uk takes 4-5 times longer than it would in MicroB. Load two or three sites and the entire device starts to become unresponsive.

I've installed and tested pretty much every nightly for the last goodness knows how many months (at least 9 months) and during that time there seems to have been zero focus on improving performance on Maemo. Either the developers are not interested, or they know they're flogging a dead horse as the N900 doesn't have enough memory (although Opera Mobile, and of course MicroB, don't appear to suffer from the same lack-of-memory problem).

So here we are, with a release candidate for Firefox 4.0 that is bound to underwhelm (if not be a downright embarrassment) as it's massively outperformed in every possible way by the stock browser and now by Opera Mobile 11 too, a product that was knocked together for fun in a few weeks.

Harsh words maybe, but it's the truth and needs saying as the elephant in the room has been ignored for too long: Fennec/Firefox Mobile 4.0 on Maemo is a huge, huge disappointment and not worth installing.