Then, of course, Firefox is not updated to 4.1 yet, although the Flashplugin finally was updated.
And, Firefox 4 has been cited for instability, especially with flash active.
One could download and install Firefox 3.17 from Mozilla and manually install the lastest Flashplugin - and have the latest updated version of 3.6 and also the latest plugin. And. 3.6xx is stable. K2 remains stuck at FF 3.16. Of course, 3.6 FF will soon be abandoned by Mozilla.
Or one could follow atolboo's advice and use the latest Chromium from the repos he referenced.
Opera is another option, as it also is fast. However, the latest version is not in the repos. FF is fairly easy to config, Opera a bit less so and I find Chrome/Chromium even less so. I always turn off geolocate and the like. I like to "see" the option, and change the flag myself.
I think the standalone browser is better for me since it allows immediate updates to the browser, without waiting for the devs to manipulate/update the package.