Ok so did you check the properties of the file as well? And where are you saving the site to .htm from? AFAIK the Browser doesn't do the upload it's the site that starts it with the Browser as a medium to connect them.

Have you tried using File > Open File ... via the Menu Bar inside Firefox to view those .htm files?

Does this only happen with .htm(l) files (i.e. do images work) Can you drag the file in a Firefox tab?

This might be a security/sandbox issue.

Boot the computer in Windows Safe mode with network support to see if that has effect in case security software is causing problems.

• http://www.bleepingcomputer.com/tutorials/how-to-start-windows-in-safe-mode/
• http://www.7tutorials.com/4-ways-boot-safe-mode-windows-10

Ok guys

Thanks for ALL the helpful suggestions.

1. WestEnd : File properties are correct and its a summery page from my Bank. I've also tried to Load the saved Bank page while Signed on to my Bank site. No luck.

2.the-edmeister: No result. Same blank Loading page.

3.cor-el: No positive result in SAFE MODE.

4. I did get one interesting Error Page trying to load the .htm's.

   " You need to enable Javascript in order to display this content "

    Which i have now found out that Mozilla/Firefox no longer supports.

Firefox supports JavaScript by default, so that is not the main problem. (Firefox/Chrome/Edge no longer run the Java plugin, but JavaScript is handled by all browsers internally without using that plugin.)

To get a second opinion, what if you open the file in another browser?

When you saved the page, did you use the "Web page, HTML only" or the "Web page, Complete" option? Unfortunately, when you save "HTML only," you sometimes will only get a shell of the page because the actual content is filled by a script rather than being part of the original page. If you save a Complete page, Firefox saves the modified page and a folder full of companion files, such as image and style sheets. That gives you a better chance of re-opening complex saved pages successfully.

Note that some pages load a basic page and require internet access to get the actual content. Saving such pages might not work in Firefox and in that case you can take a full screen screenshot and click Download to save it locally (Save saves it the screenshot to internet).

• https://support.mozilla.org/en-US/kb/firefox-screenshots