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Start Firefox in Safe Mode {web Link} by holding down the <Shift>
(Mac=Options) key, and then starting Firefox. A small dialog should appear. Click Start In Safe Mode (not Refresh).

Is the problem still there?

• shields eyes while scrolling down*

I can't make a screenshot of animation. Screenshots are still. Animation is not. I won't post animation anyway. Animation is pain.

Please post a public link to the web page.

To this web page? (Top bar appears when I scroll.)

https://support.mozilla.org/en-US/questions/1126740

To the Internet Archive? (Top bar shrinks, painfully, when I enter text i the lower search bar.)

https://archive.org/

To Apple's support site? (Top bar appeared when I scroll; however other users pointed me to a site-specific hack.)

https://discussions.apple.com/message/30326904

Do you mean the fixed bar in the attached screen shot? This bar should just appear at a certain point and be fixed in place and not animate or quiver or anything odd like that. If yours moves as you scroll, there might be a compatibility issue with your graphics card.

"This bar should just appear at a certain point and be fixed in place"

It shouldn't do that. That is animation. That does hurt.

• https://discussions.apple.com/message/30326904
• https://discussions.apple.com/6.0.3.051df32c/themes/apple_0.7.0/css/theme.css?vid=20160610-2

.persist-question.persist {
  top: 0;
  opacity: 1;
  -webkit-transition: all 0.5s ease-in-out;
  -moz-transition: all 0.5s ease-in-out;
  -ms-transition: all 0.5s ease-in-out;
  -o-transition: all 0.5s ease-in-out;
  transition: all 0.5s ease-in-out;
}

There is a close button that removes the persist class name: $j('.persist-question').removeClass('persist'); This code in userContent.css should remove this bar.

@-moz-document domain(discussions.apple.com){
 .persist-question {opacity: 0!important; display:none!important;}
}

For Stylish you would probably need a @namespace line.

@namespace url(http://www.w3.org/1999/xhtml);

For this website you can add this code to the userContent.css file.

• http://kb.mozillazine.org/userContent.css

@-moz-document domain(support.mozilla.org){
 body.scroll-header{padding-top:45px!important}
 body.scroll-header>header{visibility:collapse!important; opacity:0;}
}

The customization files userChrome.css (user interface) and userContent.css (websites) are located in the chrome folder in the Firefox profile folder.

• http://kb.mozillazine.org/Editing_configuration

• create the chrome folder (lowercase) in the <xxxxxxxx>.default profile folder if this folder doesn't exist
• use a plain text editor like Notepad to create a (new) userContent.css file in the chrome folder (file name is case sensitive)
• paste the code in the userContent.css file in the editor window
• make sure that you select "All files" and not "Text files" when you save the file via "Save file as" in the text editor as userContent.css.
  otherwise Windows may add a hidden .txt file extension and you end up with a not working userContent.css.txt file