Change the Default Languagehow can i make my firefox English
Adblock Plus išin Element Hiding helper <--remove this
BetterPrivacy <--remove this
Flash Block (Plus) <--remove this
You can simply disable Flash in the addons manager, and my thoughts are AdBlock for Firefox blocks FlashPlayer.
Ramblock <-- not finding any good information related to this plugin
Restart <--should be able to manually restart Firefox on command
Time Restart <--I personally think this is unnecessary, should be able to restart when needed and not setup to a time you think it's needed.
Microsoft.Net Framework Asistant(disabled)<--leave alone
it's also possible that Mozilla is blocking the .NET plugin due to pretty serious security exploits out there.
Firefox troubleshooting link
Adblock Plus for Opera
sounds more like the message is telling you that the browser and website can't arrive at a mutually agreeable https protocol.
Type "http://" in the beginning of the url.
Have you tried to disable any antivirus/firewall temporarily
What happens if you try a different browser?
Opera 36 is the latest Opera version that supports XP
Backup Opera Bookmarks (scroll down)
Opera: How to perform a clean reinstall of Opera
Opera help forum