- If you do frontend work, our CSS grid inspector is unparalleled https://developer.mozilla.org/en-US/docs/Tools/Page_Inspecto...
- Firefox has built-in tracking protection (https://nakedsecurity.sophos.com/2017/11/12/firefox-to-offer...)
- Powerful add-ons like Tree Style Tab make managing large numbers of tabs much easier (https://addons.mozilla.org/firefox/addon/tree-style-tab/)
- Our WebAssembly performance tends to be better
- We should have better resource utilization when you have many tabs open
- You can mute audio on a page clicking the little speaker icon in the tab
If you want to contribute to the DevTools themselves, they're built using standard web technologies: HTML/JS, React/Redux, etc. https://github.com/devtools-html/