SOLUTION 1:
Check the Date and time, Adjust Date and time. Then browse again
SOLUTION 2:
Since 64-bit version of Firefox is not yet supported by Kaspersky, you can try to uninstall Firefox 64-bit and then install the regular 32-bit version of Firefox and your problem will be solved.
SOLUTION 3:
If you want to keep using 64-bit version of Firefox, then you'll need to manually install Kaspersky antivirus root certificate in Firefox to fix this issue.
Follow these simple steps:
1. Open Firefox Preferences window and go to Advanced section. Now click on Certificates tab.
2. Under Certificates tab, click on "View Certificates" button.
3. It'll open Firefox Certificate Manager window. In Authorities tab, click on Import button.
It'll open a browse window to select the file containing CA certificate to import.
4. Now copy following path and paste it in the addressbar or file name text box of the browse window:
C:\ProgramData\Kaspersky Lab\AVP16.0.0\Data\Cert
5. Now press Enter key and the browse window will open Cert folder. Now select "(fake)Kaspersky Anti-Virus Personal Root Certificate.cer" file and click on Open button.
6. Firefox will show a confirmation window, enable all 3 checkboxes present in the window such as Trust this CA to identify websites, email users and software developers.
Now click on OK button to apply changes.
That's it. Now try to open Google and other HTTPS websites and Firefox will open them fine without any problem.
The next update of Kaspersky should automatically fix this issue and should include support for Firefox 64-bit version.
