I reset my Firefox profile to a default , new profile. In that there is no minimum font size set. With that profile if I view gerrit, the font size for commit message, diff are 8pt. 8pt is too small for displaying important text like commit message or commit diff. I think a 10pt will be ok.
This issue can be avoided if you configured min font size in your browser preferences, but having correct font size in css is nice.
Version: wmf-deployment
Severity: enhancement