multi_column_addons.css

[wincmd64]

https://github.com/MrOtherGuy/firefox-csshacks/blob/master/content/multi_column_addons.css

does it work on ESR v115.14 ?

I'm tried to add @import url(multi_column_addons.css); to userContent.css
but nothing has changed.

[MrOtherGuy]

I don't know about ESR 115, but it works in Firefox 129 and considering that last update to that style is from 3 years ago so I'd say it very likely that it works in ESR 115 as well.

I think it's more likely that your import is not working - perhaps because @import statements must be placed before anything else in the file.

[wincmd64]

ok, thx, it's helped.
can you make all the cells the same height?

[MrOtherGuy]

Yes, you can, but what exactly do you want to happen here? Should the taller ones collapse or should the items that have less text expand more? And should all items be equal height or just the items on same row? What about items like that sponsorblock - should it's name be clipped since it is taller all by itself than the Selection Search card next to it?

[wincmd64]

To be honest, I don't know what's best.
But the way it is now - is no good.

[MrOtherGuy]

Well, you can add this if you want to try:

addon-card:not([expanded]){ display: flex; }
.addon.card{ flex-grow: 1 }

I'm not convinced it's better than the current layout - but at least it isn't definitely worse, unlike the other alternatives I mentioned.