Created attachment 8541502 [details] Firefox Calibri 16 & 17px font sizes.jpg User Agent: Mozilla/5.0 (Windows NT 6.1; rv:34.0) Gecko/20100101 Firefox/34.0 Build ID: 20141125180439 Steps to reproduce: Increasing default font size from 12 to 16px in Tools\Options\Contents\Advanced in Windows 7 with Firefox versions 33 or 34. Increasing default font size from 12 to 17px in Tools\Options\Contents\Advanced in Windows 7 with Firefox versions 33 or 34. Actual results: Inspector and font viewer add-ons report: Font sizes set to 16 = is actually 13 Font sizes set to 17 = is actually 16 Expected results: Set font sizes as indicated. In the attached image the font selected is Calibri, but DejaVu Sans has the same problem. I haven't tested Serif fonts.
Works for me with 2014-12-28-03-02-16-mozilla-central-firefox-37.0a1.ru.linux-x86_64 at https://www.debian.org/ I suppose you did load the page again before checking the new size indication.
Hi Ineuw , I didn't managed to reproduce this on the latest release(43.0.2) nor the latest Nightly(46.0a1). Any font size change I made, pages were displaying the correct size of the text. User Agent: Mozilla/5.0 (Windows NT 6.1; rv:43.0) Gecko/20100101 Firefox/43.0 Build ID: 20151221130713 User Agent: Mozilla/5.0 (Windows NT 6.1; rv:46.0) Gecko/20100101 Firefox/46.0 Build ID: 20151223030323 Can you please try to reproduce this on the latest release(43.0.2) and latest Nightly(46.0a1) and provide the results? When doing this, you could create a new clean Firefox profile, or maybe test in safe mode, as some of this issues may be caused by third party installed addons or custom settings(https://support.mozilla.org/en-US/kb/troubleshoot-and-diagnose-firefox-problems). Thanks, Paul.
Since the reporter didn't provide the requested information, I will mark this issue as RESOLVED INCOMPLETE. If you still encounter this problem, please feel free to reopen this bug, or file a new one.
I agree with the closing because this issue didn't come up again in later versions of FF. I am always using beta versions, To note, I never received any notices about the comments written above. If this issue comes up again, I will open a new bug report with additional info. Thank you.