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Zoom level should be available, but is not
I am viewing a PDF file within the browser, Firefox 85, on Windows 10. I am following this webpage to make 120% zoom available: https://support.mozilla.org/en-US/questions/1201469
However, when I look at the zoom levels shown by toolkit.zoomManager.zoomValues, I already see the zoom level I want: 120% (showing as 1.2 in the list).
Unfortunately, 120% doesn't show in the list of zoom levels in my Zoom pulldown menu. The list jumps from 100% to 125%.
If I use "+" or "-" (either on the keyboard or the icons at the top of the page), the zoom jumps from 110% to 130%.
I am confused by two things.
1. The +/- zoom levels don't match the zoom levels in the pulldown menu..
2. Neither match the zoom levels shown by toolkit.zoomManager.zoomValues
How do I definitively control my zoom levels?