Browser/OS control is in 3 places:

capture.js browserForSave() generates can't do messages and MSIE warning for JSmol

moldoc.js makeJmolFooter() generates strikethrough <s> on the orange "Save ..." link.

slides.htm#browsers table summarizes what works and what doesn't

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When Quality is toggled when Save Animation help is showing,
showHelp2(makeCaptureHelp()) is called.
(This hides the help item 2 suggesting that quality be turned on.)
This happens DURING execution of the quality script by unchangedScriptToJmol(),
right after BUSY is displayed and refreshed,
and just before "antialiasdisplay = true" is echoed into msgcall #1a,
and before the scriptWait returns to unchangedScriptToJmol().

I spent hours trying to discern what calls showHelp2 without success.

I wanted to do something similar for the Background toggle to hide the suggestion for a white
background in Save Image.