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

You can try to disable WebRender by setting this pref to true on the the about:config page to see if that has effect.

• gfx.webrender.force-disabled = true

You can open the about:config page via the location/address bar. You can accept the warning and click "I accept the risk!" to continue.

• https://support.mozilla.org/en-US/kb/about-config-editor-firefox

Since the problem is random and all over the page at times it is hard to get a screen shot of the problem. I did however go to about:config and changed the setting to true and the shadowing or macro blocking hasn't appeared so far, I can't say it is fixed yet until I use it more and see if the macro blocking comes up again but so far so good. Thanks for the tip I really appreciate the help, Firefox is my favorite browser and up until the last two updates was working spectacular.

Best regards, V

I've been using firefox exclusively for the past few days after using the provided solution from Cor-el and so far there hasn't been any macro blocking or shading at all. I appreciate the insight and advice and I hope to put firefox back as my default browser soon. I of course still haven't any extensions running or hardware acceleration turned on, I only can hope that Mozilla does the right thing and fixes this problem with Windows 7.

Best regards, V