On Fri, Jun 8, 2018 at 08:14 am, Danni wrote:

Is it supposed to work with NVDA and if so any idea why it takes so long to load?

What add-ons are you using?   This sounds like it could very well be an issue with an add-on.  I would definitely try restarting Firefox in its safe mode (which is unrelated to Windows Safe Mode) and see if the issue persists.  Take a look at:  https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode 
 
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Brian - Windows 10 Home, 64-Bit, Version 1803, Build 17134  

     Explanations exist; they have existed for all time; there is always a well-known solution to every human problem — neat, plausible, and wrong.

          ~ H.L. Mencken, AKA The Sage of Baltimore