Hi
You don't say which operating system you are using.
It sounds as if something has affected, changed or corrupted your Firefox Browser settings.
Uninstall firefox and all its components from add or remove programs > restart computer > use IE to log on and download and install the latest version of Firefox, watching out for any firewall permission boxes > test firefox and set it as the Default Browser, if you want to.
start > Control Panel > (Add or Remove) Programs > (uninstall a program) > highlight Firefox > Remove all its components > restart computer.
Remeber to regularly downlad and install upgrades, updates andsecurity patches for both browsers to protect from malware.
Download and install good Spyware and Browser protection software such as, for added protection:
Malwarebytes (
www.malwarebytes.org)
SuperAntispyware (
www.superantispyware.com)
I hope this helps.
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