hello, have you set any other dpi value in your operating system than the default one (96dpi)? more information about that is available at http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/display_use_large_or_small_fonts.mspx

maybe it's also an issue with hardware acceleration - please try updating your graphics driver, or in case this doesn't solve the issue or there is no new version available at the moment, disable hardware acceleration in firefox > options > advanced > general.

Thank you philipp for your reply. Third solution is worked, I disabled the hardware acceleration. This problem I am getting from today morning when I started the system. After system is started I opened the Mozilla, then it starting updating the firefox and then the problem started the data is becoming blur as shown in attachment. Once I minimize the window then it will restore to normal. If I scroll down then the problem comes and data/pics becomes blur.

Any way finally problem is solved.

Thank you Sandeep M