FirefoxCSS-Store VS ff-ultra-compact-mode

search for it on https://firefoxcss-store.github.io/ if you need assistance go to r/FirefoxCSS

yes, we can put "links of interest" on the web to collect all the communities, websites, or whatever related to firefox themes.

You can also remove that unnecessarily large sidebar header that Firefox insists on not letting users disable via normal means with userchrome mods. Some such setups can be seen at https://firefoxcss-store.github.io/.

firefox's ui is very customizable with css and i dont see why flatpak would change that. here are some examples https://firefoxcss-store.github.io/

I like to use this

If somehow this could be integrated with the css store down the line, I can see a lot more casual Firefox users finally trying out css customisations.

you can find others here https://firefoxcss-store.github.io/

You might want to take a look at Firefox CSS. There are some themes for home page and at the end of the site is guide: https://firefoxcss-store.github.io/

I already made one https://github.com/dannycolin/fx-compact-mode

More compact mode

I made a one-liner theme with vertical toolbar, using a combination of compact mode and vertical toolbar customization. It's intended to be the best fit with tiling manager, where multiple FF window is stacked. I don't use much tabs(~10 per window) but if it's your thing, this might not be for you. It's still WIP but I'm pretty happy with the result already!

Instead of using ui-fix you can use fx-compact-mode to get back the non-oversized menus and stuff and that should work alongside Photon-Australis.

And I also made a userChrome.css that reduce even more the spaces. See: https://github.com/dannycolin/fx-compact-mode

I see your point. In case if you wanted the compact mode more even compact like i am for my laptop screen, there's this css to solve it: https://github.com/dannycolin/fx-compact-mode