Eset Internet Security and also NOD32 Antivirus (latest version 12.1.34.0) has the same problem. Every time an Eset confirmation window pops up (Allow traffic, etc.), opens the Firefox web browser, but only for a few milliseconds, then closes immediately. You can see only a flash, but I captured it in high frame rate with a screen recorder, and saw the Firefox's icon in the window in few frames. Then if I open Firefox by myself, it say, that it can't restore the previous session. A few versions before this problem never happened.
Other problem is with Internet Security and Grand Theft Auto 5. It's a legal, purchased version without modding. If I want to play online, when Internet Security is installed, I can't play. (only the story mode - offline mode - is working) When the game loading an online session, the game crashing with code 0xc0000005, and exit. It occurs also when I disabled the firewall, and other modules. But if only NOD32 is installed, I can play online without any problem.
Please help. Thank you.