Lynx.
Lynx.
I don't remember the exact procedure, but I believe you can freeze package versions, so you don't have to auto-update Firefox, even if you keep your other Ubuntu packages up to date.
No problems here!
I have 10 add-ons including the ones you listed and none complained throughout the recent round of updates.
This is on Ubuntu 12.10 with Firefox 19.02
My own experience. When I was using it on Windows I would find extensions installed that I didn't want and hadn't requested. Then deleting them would require uninstalling whatever malware it was linked to in the task manager. I'm not aware of any such thing ever occurring on Linux.
Read the easy to understand, lots of pics Ubuntu manual.
Do i need antivirus/firewall in linux?
Full disk backup (newer kernel -> suitable for newer PC): Clonezilla
User friendly full disk backup: Rescuezilla
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