Firefox only lets me shrink the font size of the Developer Tools via Cmd + -. I can't enlarge the font by pressing Cmd + +. (Pressing these keys will only change the font size of the web page, even right after I click and focus on the Developer Tools.)
I was able to restored to the default font size via about:config > devtools.toolbox.zoomValue as answered here. However, it would be onerous to reopen the configs page every time I accidentally shrink the font size of the Developer Tools.
How do I make the Developer Tools tab responsive to Cmd + + for font enlargement?
System Info
OS: macOS 14.1.1
Firefox: 120.0.1
According to the Firefox DevTools documentation for keyboard shortcuts, Cmd + + should increase the font size. So, if it doesn't, it is a bug.
Resetting the font size should work via Cmd + 0.