Firefox supports TLS 1.1, and 1.2 by default. Screenwriter 6 for Windows uses TLS 1.0 during activation, so here are the steps to change the permissions to support TLS 1.0:
(1) In a new tab in Firefox, type or paste about:config in the address bar and press Enter/Return. Click the button promising to be careful.
(2) In the search box above the list, type or paste TLS and pause while the list is filtered
(3) If the security.tls.version.max preference is bolded and "user set" to a value other than 3, right-click > Reset the preference to set the default value of 3
(4) If the security.tls.version.min preference is bolded and "user set" to a value other than 1, right-click > Reset the preference to set the default value of 1
The values for these preferences mean:
1 => TLS 1.0
2 => TLS 1.1
3 => TLS 1.2
If you encounter errors on the site, please let us know the specific message you get.