Many site issues can be caused by corrupt cookies or cache.

• Clear the Cache and

• Remove Cookies
  Warning ! ! This will log you out of sites you're logged in to.

Type about:preferences<Enter> in the address bar.

• Cookies; Select Privacy. Under History, select Firefox will Use Custom Settings. Press the button on the right side called Show Cookies. Use the search bar to look for the site. Note; There may be more than one entry. Remove All of them.
• Cache; Select Advanced > Network. Across from Cached Web Content, Press Clear Now.

If there is still a problem, Start Firefox in Safe Mode {web link} A small dialog should appear. Click Start In Safe Mode (not Refresh). While you are in safe mode;

Type about:preferences#advanced<Enter> in the address bar.

Under Advanced, Select General. Look for and turn off Use Hardware Acceleration.

Poke around safe websites. Are there any problems?

Then restart.

Thanks so much - however a call to Optimum (Cablevision) put me in touch with a tech who solved the problem . It took him some time, but finally did it. Thanks again. Seems that Firefox was blocking attempts to access Optimum e-mail in it's Classic mode, but changing to the new mode helped.

Using Microsoft ( G ) also allowed me access.

Not sure your method would have done it, probably would have.

That's good to hear. Please flag your last post as Solved Problem so others will know.

docpearl said

. . . . Firefox was blocking attempts to access Optimum e-mail in it's Classic mode, but changing to the new mode helped.

Can you explain this better for others with this problem?