I just installed the 6.06 Beta and all I can say is wow! It rocks so much. Makes me even more of a believer in Ubuntu.
As far as the firefox text, I have not had a problem with it. The bad news is that it is a problem with Firefox rendering the text. Several bugs have been submitted: See Here.
It is labled as MAJOR, so a fix will be released. Sometime....
For now though, I suggest checking out other browsers.
Try out 'Epiphany'
If you want to install it onto your computer, I will give you a few steps to do this quite easily.
Open up Terminal. (Applications > Accessories > Terminal).
Type in this.
What this command does is it refreshes and re-loads the lists of packages, which are all approved by ubuntu, on ubuntu's safe servers.
This upgrades all packages that have upgrades avaliable for them. Just a good thing to do really
sudo apt-get install epiphany-browser
This command automagically downloads and installs the browser. The last part, 'epiphany-browser' is the name of the package. There are millions of packages out there to do this with.
Another (graphical) way of doing this, which is beneficial because you can search through the packages to install, is by opening up 'synaptic', the package manager.
You can enter 'sudo synaptic' in a Terminal (sudo gives you the permisions to run this program).
Or, you can go through the menu's ( System > Administration > Synaptic Package Manager), Then search for the package at the top, scroll through the list and find out which one you need.
I know the Terminal/Console commands may be a bit of a culture shock, but once you use it for a while, everytime you go back to windows, you get frustrated at how many Icons you are looking through to find the one you want, lol, at least I do anyway.
Also, have you got the Wireless setup on your laptop? I was able to get my wireless adaptor working, I dont know how much you explored that area. I'd be more than willing to offer what little expertise I have in that area.
So now you will see that Epiphany Web Browser is in your Applications > Internet menu, and ready to be used! No restarts, Yayy...*slowly trails off.
Anyway, it's not as good as Firefox, but it ain't bad. You can mess around with different ones. Regular Mozilla might be good also.
One thing to remember about the apt-system is beware of the dates of the packages. Sometimes they get a little old (The apt managers tend to lean towards oldness and stability rather than newness and volitility). Becareful during the BETA time period of the apt system also. Sometimes they do wierd stuff.
Good Luck! I am loving the new Ubuntu so far.