Help with Java Script

[ML]

A couple of weeks ago, I started getting this pop-up about every 4th time when  trying to sign into gmail whether through Chrome or Firefox.

"The browser you're using doesn't support JavaScript, or has JavaScript turned off.
To keep your Google Account secure, try signing in on a browser that has JavaScript turned on."

But, in fact, my browsers do support JavaScript and it is always turned on.

Usually, when I go to another website (this one, weather channel, etc.) and then back to gmail . . . all is OK . . .  until another 4th time or so.

A couple of days ago, same thing happened with  wife's computer also.  But just once so far with hers.

On our computers . . . JavaScript    IS     turned on.

Any helpful hints.