User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:29.0) Gecko/20100101 Firefox/29.0 (Beta/Release) Build ID: 20140421221237 Steps to reproduce: 1. Loaded a page using custom Fonts (for Icons) 2. Changed the font files. 3. Reloaded the page using Ctrl + F5. All good! 4. Refreshed the page using F5: Firefox displays old fonts. 5. Repeat steps 3 and 4: same results. Actual results: Firefox used non-existant fonts on a page refresh and the correct fonts on a page reload. Expected results: Firefox should have replaced old fonts with the updated ones and not jump back and forth between them.
Possibly related to the font cache, mentioned in bug 931752 comment 9? See also bug 1142507.