You may have accidentally zoomed webpage(s). Reset the page zoom on pages that cause problems.

• View -> Zoom -> Reset (Ctrl+0/Command+0 (zero))

• https://support.mozilla.org/en-US/kb/font-size-and-zoom-increase-size-of-web-pages

Thanks, but nope.

How about showing the issue.

Try clearing site cookies.

Does it still happen in Troubleshoot Mode?

PC cleaned of all cookies, cache cleaned. As experiment tried Edge and Chrome, both display correctly.

Wonder if this tied to 3-D rendering and interactive web sites ( i.e. Lexus and some real estate sites)which have a problem working with Firefox.

Can you attach a screenshot?

• https://support.mozilla.org/en-US/kb/how-do-i-create-screenshot-my-problem
• use a compressed image type like PNG or JPG to save the screenshot

Does it still happen in a new profile? An easy way to test a new profile is to install Developer Edition and see if it happens there or refresh your existing profile. Make sure you stay signed out of your sync account when testing.