My biggest gripe with Firefox is the memory leak caused by some plug-ins. I think Google should just get all the popular and practical plug-ins in Firefox and put it in the core browser. I personally don't want to see memory leaks once the Chrome extensions becomes actually useful.

It's best for Google to place a survey on what plug-ins people want. Firefox has a lot of plug-ins but personally I have around 5 that I'm regularly using which should actually be in the core Firefox in the first place (e.g. Flashblock, Adblock, Download Helper, etc.).

I'm not saying that it shouldn't be developer friendly but the developer-created ones should be features that haven't been discovered yet. There are quite a few Firefox extensions that everybody uses and those extensions should be a part of the core of Chrome.