Make sure Firefox is your Default browser?

• https://support.mozilla.org/en-US/kb/How%20to%20make%20Firefox%20the%20default%20browser

Yup, it is..

I am not using Windows at present, but have not normally had problems, but you need to remember IE is likely to save as proprietary file types, whereas firefox will save as a group of related files. Maybe you are trying to open a single file. Not too familiar with Windows 7 as yet, but I have not noticed it saving web pages as a type Chrome HTML (one of the files will be .html type, and Windows may or may not display the file extension depending partly on your chosen settings)

• see http://en.wikipedia.org/wiki/MHTML

There will be Firefox extensions available for archiving/saving webpages or parts of them.

Any file or web page that I HAD saved when I was with internet explorer had just an HTML file Type Since changing to Firefox, it changed ALL the file types to Chrome HTML and any new ones I save through FF save as Chrome HTML. My thoughts are Chrome must be hiding somewhere but I can't seem to find it.

More than anything, can I change the file types so I can open them? How do I open them?

Why not have a try at saving this thread as a set of files on your computer, see what you get and whether you can open it from say a folder on your Windows 7 desktop.

Note it will be composed of several files, including for instance those for the avatar/icon that I and Swarnava use.

Try similar in IE. I am sure it will either produce a similar set of files (which could be hidden or not obvious, and may open automatically if you click on the .HTML file) or it will create .MHTML . It will not produce just a single standalone .html file. (Or if you choose to do that you will loose a lot of info)

Did you try to open such a saved web page (Save as: Web page, complete) in Firefox via File > Open File?