Do the websites display any error messages? The more information you can provide about their behavior, the better.

I haven't seen other users mention these sites recently, so I'll give you "the usual":

If a site is generally known to work in Firefox, these are general suggestions to try when it stops working:

Cache and Cookies: When you have a problem with one particular site, a good "first thing to try" is clearing your Firefox cache and deleting your saved cookies for the site.

(1) Clear Firefox's Cache

See: How to clear the Firefox cache

If you have a large hard drive, this might take a few minutes. If you do not see the number going down on the page, you can reload it using Ctrl+r to check progress.

(2) Remove the site's cookies (save any pending work first). While viewing a page on the site, try either:

• right-click (on Mac Ctrl+click) a blank area of the page and choose View Page Info > Security > "View Cookies"
• (menu bar) Tools > Page Info > Security > "View Cookies"
• click the padlock or "i" icon in the address bar, then the ">" button, then More Information, and finally the "View Cookies" button

In the dialog that opens, the current site should be pre-filled in the search box at the top of the dialog so you can remove that site's cookies individually.

Then try reloading the page. Does that help?

Testing in Firefox's Safe Mode: In Safe Mode, Firefox temporarily deactivates extensions, hardware acceleration, and some other advanced features to help you assess whether these are causing the problem.

If Firefox is not running: Hold down the Shift key when starting Firefox.

If Firefox is running: You can restart Firefox in Safe Mode using either:

• "3-bar" menu button > "?" button > Restart with Add-ons Disabled
• Help menu > Restart with Add-ons Disabled

and OK the restart.

Both scenarios: A small dialog should appear. Click "Start in Safe Mode" (not Refresh).

Any improvement? (More info: Diagnose Firefox issues using Troubleshoot Mode)

Also, your Firefox indicated that you have version 16 of the Flash plugin. That version is obsolete and probably blocked from working in Firefox. Can you update the Flash plugin in case the sites require it? See:

Flash Plugin - Keep it up to date and troubleshoot problems

An issue here is now Grammarly is actually admitting there is an issue with Grammarly being compatible with Firefox and keep getting the message to change my browser to Chrome. The Microsoft assistance discovered that when they spent 40 minutes running a complete diagnostic on my computer. I get a weekly summary still from Grammarly stating among ther statistics, I wrote over 6600 unique words, putting me in the top 97 percentile of users. But Grammarly isn't working....maybe it is just acting like a counter of words privately. And I know I'll need to get the updated Flash update, even though my computer registers that is has been already.....go figure. Lumosity is another mystery because it worked well for a month and now just isn't found on my computer, but it still produces a reminder email to train on that day's Lumosity's games......I am- not very computer literate, but this has gotten ridiculous, I have to treat it like a Monty Python moment. Thanks for all that has been suggested, Have tried some of the suggestions, and when I have the patience again tomorrow I'll try some of the generously offered ones Thank you very much.

I have Grammarly and it works just fine. Disable Lumosity. Is the problem still there?

Thanks, Fred. The way this forum is setup I couldn't answer you directly. I will try your suggestion tomorrow, as my sense of humor and patience have reached the limits of my medication for today. The irony is Grammarly worked properly in responding to you in this message.  :)

Grammarly was just updated on June 19 if not running latest version https://addons.mozilla.org/en-US/firefox/addon/grammarly-1/