Since getting version 22 (release update channel) I had a few days with very large text; today, Firefox will not start. How to get it running again???

I've searched for an .exe file in Firefox program files, but there doesn't seem to be one anywhere. I'd like to uninstall, download a new program and reinstall, but I'd rather not lose bookmarks and other settings.
Running Windows 7 on a Sony Vaio laptop. Any suggestions? Thanks in advance.

Certain Firefox problems can be solved by performing a ''Clean reinstall''. This means you remove Firefox program files and then reinstall Firefox, you WILL NOT lose any bookmarks, history, and settings. Please follow these steps:
'''Note:''' You might want to print these steps or view them in another browser.
#Download the latest Desktop version of Firefox from http://www.mozilla.org and save the setup file to your computer.
#After the download finishes, close all Firefox windows (click Exit from the Firefox or File menu).
#Delete the Firefox installation folder, which is located in one of these locations, by default:
#*'''Windows:'''
#**C:\Program Files\Mozilla Firefox
#**C:\Program Files (x86)\Mozilla Firefox
#*'''Mac:''' Delete Firefox from the Applications folder.
#*'''Linux:''' If you installed Firefox with the distro-based package manager, you should use the same way to uninstall it - see [[Installing Firefox on Linux]]. If you downloaded and installed the binary package from the [http://www.mozilla.org/firefox#desktop Firefox download page], simply remove the folder ''firefox'' in your home directory.
#Now, go ahead and reinstall Firefox:
##Double-click the downloaded installation file and go through the steps of the installation wizard.
##Once the wizard is finished, choose to directly open Firefox after clicking the Finish button.
Please report back to see if this helped you!

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*https://support.mozilla.com/kb/Server+not+found
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Since getting version 22 (release update channel) I had a few days with very large text; today, Firefox will not start. How to get it running again???

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