This is not an application issue. However, there are a number of third party websites that discuss variations of this issue and how to resolve them.

Different font rendering between Chrome and Firefox

Reloaded windows 10 and Firefox now text is blurry

Font rendering not correct - Windows 10

Fonts not displaying correctly from websites in Firefox

CSS - Fonts Render Differently in Firefox and Chrome

Note: We provide links to third-party websites in an effort to help you resolve your issue. We are not responsible for the information on third-party websites, and we cannot assist in implementing the solution on these websites.