firefox 18.01 - (Error code: sec_error_bad_signature)

That is FF warning of an issue with the sites certificate. Whether it is accurate or not I can't say. Can you provide an address so we can check it with our FF 18.01?

Have a look here, it is for an older version, but is still valid

certificate error | Firefox Support Forum | Mozilla Support

Not the caution, if you get warned of a problem with a certificate, and choose to ignore it, you should be certain it is safe (and how can you be?)

A Guy

you could install the web of trust add on, that will give you another indicator about sites and details as to why a site may be untrusted.

https://addons.mozilla.org/en-US/fir...browsing-tool/

the error mesg. seems to be google related no searches can be done with google or gmail.com allowed
I tried the certificate fix, to no availe

You might try starting FF in Safe mode to see if it is add-on related.

Open FF> Help> Restart with add-ons disabled



A Guy