Hi OTMS...
Yes, Shadow Defender is a really great product. It is like a security blanket on your hard disk, so no matter what you do (certain conditions apply), when you reboot, everything will return to the way it was. If you want to install a program to see if it fits in with your setup and test it out for a while, you can. If you decide to get rid of it, just exit Shadow Mode, reboot and your system will look like it did before you installed and tested. Small product, big punch.
It also allows you to set a password, so no one but you can go back into your system and make changes. It has a section for folders and files that you want to exclude from defending. This comes in handy for Download Managers, which split up one file into multiple files and need direct access to reassemble the file. Shadow Defender also offers encryption of write cache, for example all the stuff you do while in Shadow Mode will take up space. That space can be encrypted so no perves can have a read
This is just a short explanation. Here is a proper review by UmbraPolaris -
http://malwaretips.com/threads/review-shadow-defender.12646/
In regards to CyberFox, FireFox, WHATEVERFox... I believe it all comes down to how long you have been using the Internet, and how much control you desire over what you use/do on the Internet. Remember at the beginning, first steps on the internet, it was all about Microsoft Internet Explorer. Then you get more logic and wisdom and you realise there is Mozilla Firefox. Eventually, you come across dedicated spinoffs, like Waterfox, Cyberfox, Torch, Chromium etc... For myself, I was just sick of the plain Firefox, wanted something different with a another level of impact; something that was designed for 64 bit operating systems and designed for Intel chipsets (Cyberfox has a specific browser release for Intel and for AMD).
It all comes down to what makes you tick, and what you feel you will enjoy. Don't knock back IE11, it still has its uses