Checked it with Shareaza and it seems the same: 73ca4be16e674899b4f37122c7a64121 Yeah, I had the same problem but I know how to fix it now. When you go into taskmanager and try to end the firefox.exe proces it will refuse it. The workaround is to use the uninstaller, when it says that the firefox process is still running you just have to click the ok button a few times, it will succeed after a few attempts. Let it uninstall firefox, don't worry, you won't lose any settings or bookmarks or whatever. Now use the 1.0.7 installer again to install firefox and after it's completed you will be able to use it again