Well I just Google'd "Firefox 4 RC blurry" and it does seem that some other people are having this issue too. However, I am not. The installer upgraded my FF install from 3.6.15 to 4.0 RC.
There are some posts on Google which reference "Direct2D" as being in use for the text. Also there is the obvious term hardware, therefore your computer abilities or lack there of may be an issue? Perhaps you might want to run the DirectX updater too? I did that on (this) recent install of Window's 7 and it found a ton of "Direct NAMEHERE" updates for update/installation. it may help, or may not, but it doesn't hurt to be up to date.
How exactly does it look for you? It looks just peachy on my end and runs perfectly too.
It looks blurry, and it looks like a different font completely than what 3 used. Downloaded RC1 again, and I can't get over this font change, I really can't.
This Blurry effect is related to MS Direct write, be aware that it also affects IE9, its only up to MS to fix their API, it is unrelated to DirectX
DirectWrite - Wikipedia, the free encyclopedia
My Computer
- Computer type
- PC/Desktop
- Computer Manufacturer/Model Number
- Custom Build
- OS
- Windows 10 Pro x64, Arch Linux
- CPU
- Intel Core 2 Quad Q8200 OC'd 3.08GHz
- Motherboard
- Asus Rampage formula LGA775
- Memory
- 8GB DDR2 900Mhz
- Graphics Card(s)
- MSI GT730 2GB GDDR5 (Kepler)
- Sound Card
- Supreme FX2
- Monitor(s) Displays
- Samsung LS22F350 LED
- Screen Resolution
- 1080P
- Hard Drives
- Kingston SSDNow UV400 120GB, 500GB Hitachi, 2TB Samsung, 500GB Seagate FreeAgent, 640GB Samsung, 160GB Toshiba (Arch)
- PSU
- AeroCool 500W Bronze
- Cooling
- Cooler Master V6 + 3X fans
- Keyboard
- Prolink keyboard
- Mouse
- Logitech M705
- Internet Speed
- 1MiB/s
- Browser
- Chrome Beta