Do you have security software that sends it own certificate or are you using a proxy to connect to internet?

There is security software like Avast and Kaspersky and BitDefender and ESET that intercepts secure connections and sends their own certificate or that incorporates special web shielding features that can block content.

You can check for problems with preferences.

Delete possible user.js and numbered prefs-##.js files and rename (or delete) the prefs.js file to reset all prefs to the default value including prefs set via user.js and prefs that are no longer supported in current Firefox releases.

• http://kb.mozillazine.org/Preferences_not_saved
• http://kb.mozillazine.org/Resetting_preferences

Thanks for your reply cor-rel: I dont have any security software installed and dont use proxy to connect to Internet.

• only one prefs.js file is found in %APPDATA% and it it has all permissions to read , write.

1. if Firefox is restricted to use strict TLS 1.2 only, will it impose any HTML or JS version restriction from Java application side?

Hi cor-rel,

Using Web Console option in firefox, i have seen some of the contents of the web page uses external HTTP server which uses TLS 1.1 to connect...so Firefox skipped those mixed contents when restricted to TLS 1.2. Now i got the solution.

See also:

• SSleuth: https://addons.mozilla.org/firefox/addon/ssleuth