Have you tried firefox developer edition: https://www.mozilla.org/en-US/firefox/developer/

I prefer it to chrome.

Edit: Reason I point it out is, that it took me far too long to realize it was available.

Wow, I never knew this existed. It's not even listed on the download page as "FireFox Developer", you need to click "Learn more about dev tools". From what I can tell, it's normal Firefox, but with added experimental features turned on.

Is this just a tweaked and tuned Firefox release aimed at developers? I like how they also go out of the way to enable dark theming :-)

Yep. Iirc it's based on nightly.

I'm pretty sure it's beta, the former "aurora" channel.

Wow, didn't know this was available! They should add a message when the dev tools is opened to let developers know avout this developer edition. Thanks, will give it a try!

I wish it was the other way around. I miss the option to modify requests and re-send them in Chrome each and every day. That‘s something Firefox has.

What am i missing since i used Firefox Dev-Tools all the time?

Firefox has Resend and Edit and Resend in the network pane, Chromium can debug NodeJS, has a unified sources tab that let's you edit files and (if you set it up) save them, and becomes unresponsive when prettifying large js files faster than Firefox. Those are the only differences I know of.

Firefox recently revamped the performance tools, that was the only thing keeping me in Chrome's developer tools. The new tools in Firefox beat out Chrome imo.

In which way do they beat Chrome?

Difficult to pinpoint specifics, it's probably a matter of personal preference. I just enjoy working in Firefox's performance tools more than I enjoy working in Chrome's now.

Previously Fx lacked so many features that existed in Chrome that you couldn't really compare them.