it's a free country software, the only limit to modification is your own good sense. This repo has a ready made user script to move the address to the tab bar like in your sceenshot. https://github.com/Aris-t2/CustomJSforFx/wiki
Custom CSS tweaks for Firefox
I currently use a CSS theme that makes it look more like older versions of Firefox
Appwrite - The Open Source Firebase alternative introduces iOS support. Appwrite is an open source backend server that helps you build native iOS applications much faster with realtime APIs for authentication, databases, files storage, cloud functions and much more!
🦊 I respect proton UI and aim to improve it.
Thankfully Firefox-UI-Fix exists to undo Mozilla's bad (in my opinion) choices.
A collection site of Firefox userchrome themes, mostly from FirefoxCSS Reddit community.
Maybe this can help https://firefoxcss-store.github.io/
Looking for an old chrome theme for fire/waterfox
2 projects | reddit.com/r/firefox | 10 Nov 2022
I just switched my browser from Chrome to Firefox
2 projects | reddit.com/r/firefox | 27 Sep 2022
Need help in tab bar design. I want tabs to look like internet explorer, tab are already in compact mode but still big to my liking, I want tab size & tab bar look like explorer, possibly remove tab bar background & make tabs small just like IE.
1 project | reddit.com/r/FirefoxCSS | 17 Jan 2023
A Safari-like browser for Windows 11 (wip) 👀
1 project | reddit.com/r/Windows11 | 14 Jan 2023
Layout of Firefox window
2 projects | reddit.com/r/firefox | 13 Jan 2023